Top 12 Best Exhaust G37 Coupe: #1 Will Surprise You

A cheap exhaust on a G37 coupe usually shows itself within a few months: a dull drone at 68 mph that makes conversation impossible, tips that pit after one salted winter, or a check engine light from a badly placed O2 bung. Choosing the best exhaust g37 coupe setup means avoiding all three.

Three things separate a good system from a poor one. Material comes first: 304 stainless resists rust far better than 409, which can surface rust within a couple of seasons. Pipe diameter matters too; 2.5 inches suits the stock 3.7L VQ37, while 3-inch piping rarely adds power without a tune and often increases drone.

Fitment is the rest, with correct hanger positions and flanges that bolt on without cutting.

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Our Top Picks 3	Burn Stainless Axle-Back	Check Price

Our Selected Top 12 Exhaust G37 Coupe Worth Your Money

The list covers twelve exhaust systems made for the G37 coupe. Each entry explains how the setup sounds and performs on daily drives, which drivers it suits, and where it falls short. You also get fitment notes plus pros and cons for every option.

1. PLESIU Axle Back Exhaust for Infiniti G37 Coupe

The PLESIU Axle Back Exhaust for Infiniti G37 Coupe bolts in behind the rear axle and replaces the quiet factory muffler section with polished stainless piping and 4 double walled tips. It suits a G37 coupe driver who wants a deeper note and a sharper rear end without touching the mid-pipe or cats.

Installation happens under the rear bumper with a jack and basic hand tools. You unbolt the stock mufflers, hang this section on the factory hangers, and bolt the 3/8 flanges to the stock mounting points before tightening the 2.50 piping joints. Fitment is coupe-specific, so the hangers and flange holes line up with the original spots.

After that it needs nothing but an occasional wash, and the polished stainless wipes down with regular soapy water.

The 2.50 piping moves exhaust out with less restriction than the stock muffler section, giving the 3.7L a better chance to breathe. The 3/8 flanges are thick enough to resist warping through heat cycles, and stainless holds up to rain and road salt far better than mild steel. The double walled tips carry the high-end look the listing promises and hide heat tint better than thin single-wall tips.

The main limit is the axle-back format itself: sound and styling change clearly, while horsepower stays close to stock because the mid-pipe is untouched.

This axle back bolts in place of the stock muffler section behind the rear axle, using 2.50 inch piping and four inch double walled tips in polished stainless steel. Installation is a straightforward bolt-on job with jack stands and hand tools, no cutting or welding needed. Expect a deeper note under throttle that quiets down at steady highway speed.

Drivers who want a louder exhaust note without touching headers or mid pipes will be happy here, especially at this price point. The polished tips dress up the rear end nicely. Anyone chasing real horsepower should pick a full cat back system instead, and daily commuters who hate cabin drone on long highway trips should look elsewhere.

Fitment uses 3/8 inch flanges, and the stainless build should shrug off road salt better than mild steel, though the polished finish shows water spots after washing. Fresh gaskets and hardware make installation easier. The listing averages 4.3 stars across 14 ratings, a solid number for this part category. Wipe the tips dry to keep them looking new.

Pros

• Stainless build with a polished finish resists rust
• 4″ double walled tips give a high-end rear look
• 3/8″ flanges offer solid, warp-resistant mounting
• 2.50″ piping improves flow over stock mufflers

Cons

• Axle-back only, so power gains stay modest
• Small rating base: 4.3 stars from 14 reviews

2. Invidia HS07IG7GID Gemini Cat-Back Exhaust System

The Invidia Gemini is a 60 millimeter cat-back built for the 2007-Up Nissan G37 Coupe, finished with rolled titanium tips that measure 110 millimeters across. It suits a driver who wants a deeper, meatier note and a clean rear-end look without hacking up the stock exhaust.

The strongest point is how it lines up under the car.

Setup is a Saturday morning with jack stands, sockets, and a second pair of hands for the mufflers. The system hangs on the factory hangers, so once each section is roughly in place, the bolt holes find their lines. The 40 pound weight is manageable, though the muffler end takes a firm hold while you align it.

Day to day the car speaks louder: a thicker note on cold starts and a lower hum at speed. Wipe the titanium tips with polish now and then to keep them bright.

The main job here is a deeper, more confident exhaust note with a freer flow, and the 60 millimeter piping supports that without changing the character of the car. Build quality shows in tight welds and the rolled titanium tips, which finish the rear of the coupe with a polished look.

It carries a 4.9 out of 5 rating across 23 reviews. The trade-off is scope: this is a cat-back only, so the midpipe stays factory unless you buy more.

The Invidia Gemini cat-back bolts behind the factory catalytic converters on a 2007 and later G37 coupe, with 60 millimeter piping and 110 millimeter rolled titanium tips. The kit ships at 40 pounds, so handling it in the garage is simple. After the first few drives, recheck the clamp bolts and nudge the tips level, since alignment can drift.

Drivers who want a deeper tone with rolled titanium tips on a stock G37 coupe will be happy here, since the fitment is coupe specific and everything bolts to factory locations. Skip it if you drive a G37 sedan, plan a turbo build that needs larger piping, or want the quietest highway cruise; a milder setup suits those needs better.

For the money, this sits between the factory muffler and a full race system: keeps the stock catalytic converters, adds titanium tips, keeps weight at 40 pounds. Check the part number HS07IG7GID against your model year before ordering, and budget an afternoon with a lift or jack stands. Anyone handy with basic tools manages the swap without cutting or welding.

Pros

• Rolled titanium tips give the rear a distinctive look
• Deeper exhaust note makes normal driving more enjoyable
• Hangs on factory hangers, so installation stays simple
• 4.9 out of 5 stars from 23 reviews

Cons

• Cat-back only, so bigger gains need a downpipe too
• At 110 millimeters the tips are big; check bumper clearance

3. Burn Stainless Axle-Back Exhaust for Infiniti G37 Coupe

The Burn Stainless Axle-Back Exhaust from TUNERBITS swaps the stock rear mufflers on an Infiniti G37 coupe for stainless piping with 4 inch double walled tips. It suits drivers who want a deeper tone and a dressed-up rear end without touching the midpipe. The burn finish is the first thing anyone notices.

An axle-back bolts in after the midpipe, so setup means unbolting the factory mufflers and hanging this section in their place, with no cutting or welding. Cold starts bring a deeper bark, and the tone settles into a steady growl around town. The stainless with its burn finish needs an occasional wipe to keep the coloring even, and the 4 inch tips fill the rear bumper cutouts.

The wider piping moves exhaust out with less restriction, so the engine breathes better under throttle. Stainless steel construction stands up to rain and road salt, and the double walled tips keep a clean edge rather than dulling at the rim. The product holds a 4.2 out of 5 rating across 12 reviews, and the burn finish draws most of the praise.

The most common complaint is the axle-back trade: power gains stay modest because the midpipe stays stock, and some drone appears at steady highway speed.

The 4.2 star average across 12 ratings points to a product most people keep, and everyday use matches that. The bolt-on swap behind the rear axle takes basic hand tools and an afternoon. The 2.5 inch piping and 4 inch double-walled tips give the G37 a deeper idle note that turns aggressive past half throttle.

This suits a coupe driver who wants a louder, deeper tone and colored burn tips without paying for a full cat-back system. Weekend highway cruising stays bearable with windows up. Anyone chasing real power gains should save for headers or a tune instead. Apartment dwellers with thin walls and early shifts will regret the cold-start volume.

Plan on reusing the factory hangers and either clamping or welding the slip joints. A torque wrench and penetrating oil help with rusted stock bolts. The burn finish shifts between blue and gold with heat, so metal polish will dull it if you scrub too hard. Wipe the tips after rain and check the clamps after a few weeks.

Pros

• 4 inch double walled tips look high end from behind
• Stainless build resists rust through wet, salted winters
• Bolts in place of stock mufflers, no welding needed
• 2.50 inch piping frees up exhaust flow

Cons

• Power gains stay modest, midpipe remains stock
• Some drone at steady highway speed

4. DC Sports Y Pipe

The DC Sports Y Pipe replaces the factory mid-pipe on a G37 coupe and opens up exhaust flow for improved performance. It suits anyone wanting a straightforward bolt-on upgrade without cutting or custom fabrication. Its biggest strength is the complete kit approach, since gaskets and hardware come in the box for install day.

Installation is a home-garage job with hand tools and jack stands. The included gaskets and hardware mean no extra trips to the parts store, and the design bolts into place without cutting or welding. Driving with it, the deleted flex section gives the exhaust a firmer, more direct feel under throttle.

The higher routing adds real ground clearance over the factory piece, which matters most on lowered cars and steep driveway aprons.

Free of the stock unit, the engine moves more air through the 2.5 inch, 16 gauge piping and responds noticeably quicker on throttle. The 3 inch rear flange gives plenty of surface area for a tight joint, and the 1 year warranty covers manufacturing issues. The deepened exhaust note is the strongest point of praise.

A raspy tone under hard acceleration is the most common complaint.

On a G37 coupe this pipe bolts in using the gaskets and hardware that come in the box, needing jack stands and basic hand tools. The 2.5 inch piping flows better than the stock setup, and the raised routing clears speed bumps more easily than the factory piece. Cabin noise rises at steady highway speed.

Drivers who want extra sound and a bit of throttle response without touching the headers will like this one, especially at its price. Anyone chasing a quiet commute, a mellow touring tone, or maximum power from a boosted build should step up to a larger 3 inch or resonated y-pipe instead. It suits stock and lightly modified cars.

Fitment is the usual question mark with bolt-on exhausts, so leave slack to line up the 3 inch rear flange and re-torque everything after a short drive. The 16 gauge steel is thicker than some budget pipes use, and DC Sports backs it with a one year warranty. Part number NMS4201 covers this application.

Pros

• Gaskets and hardware included in the box
• Added ground clearance helps on lowered cars
• 2.5 inch piping flows better than stock
• 1 year manufacturer warranty coverage

Cons

• Raspy tone under hard acceleration
• Deleted flex section means less vibration isolation than stock

5. Stainless Steel Exhaust Header, Nissan 370Z & Infiniti G37

This is a pair of polished 304 stainless exhaust headers for the 3.7L V6 VQ37VHR, covering the Nissan 370Z from 2009 to 2018, the Infiniti G37 Coupe from 2008 to 2013, and the 2009 to 2014 G37 Sedan. It suits a daily-driven Z or G with tired factory manifolds.

The standout strength is corrosion resistance in humid climates.

Installation is the first hurdle. The kit ships without instructions and the maker recommends a professional installer, so budget for shop labor or bring solid garage experience. The box holds a header for each bank plus four gaskets and six bolts, which is lean, so plan on reusing or sourcing extra hardware.

Once torqued down, there is little to think about: the polished surface wipes clean, and the stainless construction means no flaking rust to scrub off each spring.

The job is swapping the factory manifolds for something that will not rot. The 304 stainless steel and precision polished surface are aimed at humid climates and road salt, the conditions that flake through ordinary exhaust steel.

Build quality shows in the details: joints are TIG welded, edges are burr-free, and the CNC machined cuts leave the flange faces flat so the included gaskets seat evenly. The weld finish draws the strongest praise. The common complaint is the missing instruction sheet, which leaves the install to a professional.

On a G37 coupe the stock manifolds sit close to the VQ37VHR and soak up years of heat. This 304 stainless pair swaps in with the included gaskets and six bolts, and the polished surface wipes clean with a rag. The engine bay runs warmer on long drives, so recheck the bolts after a few heat cycles.

Anyone refreshing a 370Z or G37 coupe on a budget will like it: this pair covers 2009 to 2018 Z34 cars, G37 coupes from 2008 to 2013, and sedans from 2009 to 2014. First-timers should look elsewhere, since the box holds no instructions and the listing recommends professional installation. Big turbo plans call for a complete system instead.

The flanges are CNC machined and the joints are TIG welded, so the seams look tight with no burrs to shave your knuckles. Four gaskets and six bolts ship in the box, though you may want fresh studs and extra gaskets on hand. Wipe the polish down now and then, since finger marks and road film dull the shine.

Pros

• 304 stainless steel resists corrosion in humid climates
• TIG welded joints with clean, tight seams
• CNC machined flanges, edges free of burrs
• Four gaskets and six bolts included in the box

Cons

• Ships without any installation instructions
• Maker recommends professional installation, expect labor costs

6. Exhaust Header Pipe Kit for Nissan 370Z / Infiniti G37

This stainless header kit swaps out corroded factory plumbing on the 370Z and G37 coupes running the 3.7L VQ37VHR. It suits a home mechanic replacing a leaking pipe rather than chasing a full aftermarket system. The biggest draw is the complete package: both left and right pieces, gaskets, and bolts arrive together.

Check your model year and engine code before ordering, since fitment stops at 2009-2018 on the 370Z and 2008-2013 on the G37. Installation follows the factory pattern: unbolt the old section, clean the flange faces, set the new gaskets, and tighten the supplied bolts. The flange dimensions match stock locations, so the pipes line up without forcing.

After that it just sits there, and the stainless tubing shrugs off rain, salt, and heat cycles.

Stainless tubing with welded joints forms the core of the build, and the manufacturer points to corrosion resistance under daily driving as the payoff. The two pipes seat into factory flange locations, and the included gaskets and bolts handle the seal and clamping. Feedback is thin: the listing shows 5.0 stars across just two reviews, so long-term wear reports stay scarce.

The 30-day warranty is also short for an exhaust part that lives over hot pavement.

The rating sits at 5.0 stars, though that rests on just two ratings, so the sample is tiny. The kit arrives as two stainless steel pipes with gaskets, bolts and mounting hardware in one box. Flange dimensions match the stock mounting locations on the VQ37VHR engine, and the manufacturer covers the parts with a 30-day warranty.

Drivers shopping for the best exhaust for a G37 coupe or a 2009-2018 370Z on a budget get a matched left and right pair with gaskets and bolts included. Anyone expecting recorded horsepower gains should keep looking, because the listing promises fitment and hardware, not performance numbers. Builders wanting thicker flanges or coated tubing should compare pricier brands first.

Plan for a garage job rather than a driveway one; stock exhaust bolts on a car this age often need penetrant and a breaker bar. Check the year, engine and flange bolt pattern against your car before ordering, since the 30-day return window is short. For the price, getting both sides plus hardware in one shipment is the draw.

Pros

• Both sides ship together with gaskets and bolts included
• Stainless steel tubing resists corrosion through daily driving
• Flanges match factory mounting points for simpler alignment
• Direct replacement design keeps stock-style routing

Cons

• 30-day warranty, short for an exhaust component
• Only two reviews so far, long-term feedback is scarce

7. Northeastern Exhaust Front Flex Y-Pipe

The Northeastern Exhaust Front Flex Y-Pipe is a direct replacement for the worn factory flex section and y-pipe on the G37 coupe, along with several related Infiniti models. It suits anyone chasing an exhaust rattle or leak who wants a bolt-on fix. Its biggest strength is the complete installation package: gaskets and clamps come included, so no welding is needed.

On a lift the job is straightforward because the routing matches the factory layout and the flanges line up with stock connection points. You still want a shop for this one, since the assembly weighs 51 pounds and the working position is awkward under a low coupe.

After the first start, run a leak check on every joint and confirm the tailpipe extends past the body, because exhaust under the cabin is a safety hazard rather than a nuisance.

Build quality rests on 409 grade stainless steel, chosen for corrosion resistance in salt and slush, which is exactly what kills these pipes in northern states. The design minimizes backpressure, and the reduced restriction can improve horsepower and torque over a clogged stock unit. The material is the strongest argument for this pipe.

The weakest point is the substitution policy, which lets the company ship a similar or equivalent part instead of this exact assembly.

This flex y-pipe sits between the catalytic converters and the midpipe, so the flex joint soaks up engine movement instead of cracking welds. The 409 stainless holds up far longer than mild steel, though it will show surface rust after a couple of salt winters. Bolt it on, check for leaks, and expect the sound to stay close to stock.

A G37 coupe or G35 sedan with a torn flex pipe and a rattling heat shield is the ideal candidate, since the stock y-pipe usually rots before anything else. Keep it if you want a bolt-on fix a mechanic can finish in an afternoon. Anyone chasing a gain in horsepower should pick a performance y-pipe with a larger diameter instead.

Next to a stock replacement, the included gaskets and clamps save a trip to the parts store, though a second set of hands helps with the 51-pound assembly. Plan on penetrating oil for rusted factory bolts, and let a certified mechanic do the final check. The company may substitute an equivalent part when this one runs out of stock.

Pros

• Direct bolt-on fit for the G37 coupe and related models
• Gaskets and clamps included in the box
• 409 stainless steel resists corrosion and rust
• No welding or special fabrication required

Cons

• Certified mechanic installation recommended, not a beginner job
• An equivalent part may be substituted in place of this one

8. Northeastern Exhaust Resonator Muffler Kit Infiniti G35/G37

The Northeastern Exhaust Resonator Muffler Kit is a replacement exhaust assembly for the 2007-2008 G35 3.5L and the 2009-2013 G37 3.7L. It fits a driver whose factory exhaust has gone rusty or raspy, one who wants a complete order instead of hunting individual pieces.

Its biggest strength is exact coverage of every listed model year.

Setup is a shop job, and the maker says so outright. A certified mechanic should handle the install, tighten the clamps, then run a leak check on every joint before you drive anywhere.

The tailpipe also needs to extend past the body so fumes vent outside the cabin rather than into it. The clamps and gasket ship in the box, so the shop is not making surprise parts runs. Afterward, the resonator keeps the tone tame and the design cuts back pressure.

Build material is 409 grade stainless, chosen for corrosion resistance in tough conditions, which matters after a winter of salted roads. The flow-focused design minimizes back pressure, and the maker links that to possible gains in horsepower and torque. The 3.8 out of 5 average across three reviews reads as a decent but small sample.

The clearest warning involves substitution: the maker may ship an equivalent part when stock runs short, so what arrives can differ from the photos.

The kit gives a G35 or G37 a direct replacement for a rusted factory exhaust, with clamps and a gasket already in the box, so one shop visit covers the whole swap. The 409 stainless piping stands up to road salt and slush. Daily driving stays quiet and stock-sounding, with nothing flashy about the sound.

This part suits someone with a 2007 to 2013 G35 or G37 whose factory muffler has rusted through and who wants a straightforward replacement rather than a custom exhaust. Skip it for a track build or anyone chasing a louder tone. Expect stock-style fitment and function, not measurable horsepower gains from this kind of part.

Three ratings give it a 3.8 out of 5 average, a small sample, so treat the score loosely. Northeastern warns that a similar part may ship in place of this exact unit. Have a certified mechanic handle the install, check every joint for leaks afterward, and confirm the tailpipe exits beyond the body for safe exhaust discharge.

Pros

• One kit replaces the whole worn assembly, no piecemeal sourcing
• Clamps and gasket included with the kit
• 409 stainless steel resists corrosion in harsh conditions
• Flow design minimizes back pressure for possible power gains

Cons

• Equivalent part may be substituted at the maker’s discretion
• Certified mechanic install required, so budget for labor

9. Exhaust Pipe Kit for Nissan 370Z & Infiniti G37

This kit replaces the exhaust manifolds and headers on the 3.7L V6 VQ37VHR engine in the 2009-2018 Nissan 370Z and 2008-2013 Infiniti G37. It suits anyone whose factory manifolds have cracked, warped, or rusted out who wants a stainless replacement instead. Its biggest strength is the 304 stainless build, which stands up to rust.

Installation follows the same path as any manifold swap: lift the car, unbolt the stock manifolds from the VQ37VHR heads, and set the new pipes in place. The CNC-shaped flanges are what save time, because the mounting holes land where the head expects them. Day to day, the kit asks nothing from you beyond an occasional wash to clear road grime.

The stainless grade is chosen for exactly the conditions that destroy ordinary exhaust hardware, wet winters and salted roads.

Moving exhaust off both banks of the 3.7L without leaks is the core job, and the construction aims straight at it. TIG welding lays narrow, even beads along every joint, and CNC machining keeps each flange flat and true.

A flat flange against the head is what keeps the joint sealed through heat cycles. Weld quality is where this kit earns its strongest praise. The weak spot is what arrives in the box: contents appear as a single photo rather than an itemized list, so you may reuse your factory studs.

Day to day, this is a direct bolt-on for the 3.7L VQ37VHR in a 2009-2018 370Z or 2008-2013 G37. The 304 stainless steel shrugs off road salt and heat cycles, and the CNC-formed flanges mate up flat to the head. Cold starts stay calm, and the note drops deeper once things warm up. Recheck the bolts after a hundred miles.

Anyone chasing the best exhaust G37 coupe upgrade on a budget will like the fitment and the 3-year warranty that covers free replacement. Shade-tree mechanics with basic tools can handle the install over a weekend. Track drivers hunting measured power gains should step up to a bigger name brand. Skip it unless your car is a 2008-2013 G37 or 370Z.

Included components match the first product picture, so lay everything out before you start. Swap in fresh gaskets while the stock manifolds are off, since reuse invites leaks. Wipe the stainless with soapy water after winter driving to keep brake dust from staining the welds. The 3-year claim runs through the seller, so save your order number.

Pros

• 304 stainless steel resists corrosion and road salt
• TIG welds form tight, clean seams
• One kit covers both 370Z and G37
• 3-year replacement warranty included

Cons

• Box contents are not itemized beyond a photo
• Warranty claims must clear the seller first

10. Exhaust Front Flex Y-Pipe for Infiniti G37/370Z/350Z/G35

This is a bolt-in front flex Y-pipe made for the Infiniti G37 coupe, G35, 350Z and 370Z. It suits anyone whose original pipe has cracked at the flex joint and who wants a straight swap instead of custom fabrication work. Its biggest strength is direct fitment across all the listed model years.

Installation stays simple because it is shaped as a drop-in replacement. You line it up with the factory flanges, bolt it in and reconnect without cutting or ending up with leftover gaps.

The flex joint absorbs engine movement while you drive, so hard shifting or rough pavement does not strain the connections. Routine use stays quiet and predictable, and the durable pipe material is meant to keep handling the high exhaust temperatures that come with daily driving.

The flexible section holds a steady seal between the engine and the mid-pipe, and the built-in converters handle emissions conversion. Praise lands on the direct fitment, since it bolts into place without major work being done to the car. The common complaint targets the paperwork, because the 1-year warranty is short for a part sitting this close to the engine, and the box lists only the Y pipe, so gaskets and hardware land on you.

The pipe ties the front flanges to the mid-pipe and carries both catalytic converters in one welded assembly. The flex joint does the moving, so nothing cracks from engine twist. A real install on a 350Z or G37 means soaked factory studs and stubborn spring bolts, so plan an afternoon with penetrating oil, stands, and a sawzall.

This suits a daily driver whose original y-pipe has rotted or started rattling, especially on a well-used 350Z or G35. Anyone with ramps, jack stands, and patience can skip the shop labor. Skip it if you want a louder race pipe, extra power, or a name brand; and confirm your state accepts aftermarket converters first.

SleYuYir backs the part with a one-year warranty and lists fitment for G35, 350Z, 370Z, and G37, but the year ranges are messy, so match yours before ordering. Retorque the flange nuts after a few heat cycles. Fresh gaskets cost a little extra and prevent the small exhaust tick people chase for weeks.

Pros

• Drops into stock flanges without cutting or welding
• Covers G37, G35, 350Z and 370Z model years
• Handles high exhaust heat from daily driving
• Includes front and rear catalytic converters in the setup

Cons

• 1-year warranty is short for this part
• Box lists only the Y pipe, no gaskets or hardware

11. Northeastern Exhaust Y-Pipe Resonator Muffler Kit G35/G37

The Northeastern Exhaust Y-Pipe Resonator Muffler Kit replaces the worn mid-section on a 2007-2008 Infiniti G35 or a 2009-2013 G37. It suits drivers who want one complete replacement section instead of hunting loose parts.

Its biggest strength is the 409 grade stainless steel, which resists the corrosion that takes down the original pipe.

Plan on a shop visit, because Northeastern wants a certified mechanic handling the install. The kit arrives with the clamps and gaskets included, so the new y-pipe, resonator and muffler get fitted and sealed in one appointment. You then check every joint for leaks and confirm the tailpipe exits past the body, which matters since escaping exhaust can pull into the cabin.

From there it fades into everyday driving, running quiet until the next winter salt season tests the steel.

Performance comes down to flow. The design cuts back pressure, which can add horsepower and torque in daily driving. Build quality rides on 409 grade stainless, a corrosion-resistant steel chosen for harsh conditions at a friendlier cost than premium 304.

The kit carries a 4.6 out of 5 average from three reviews, a small but positive record. The limits sit in the fine print.

The limited lifetime warranty allows only one replacement, excludes labor and shipping costs, and any installed piece is non-returnable.

The kit averages 4.6 out of 5 across three ratings, so the sample is thin. Day to day, it replaces the rusted Y-pipe, resonator and muffler section on a G35 or G37. Clamps and gaskets come in the box, and the 409 stainless handles road salt better than the corroded stock piping it replaces.

Anyone with a 2007 to 2013 G35 or G37 coupe whose exhaust has started to drone, rattle or smell in the cabin will get what they need here: a like-for-like replacement that keeps the stock sound. Skip it for a louder cat-back, polished tips or 304 stainless show car; this is basic transportation hardware.

Installation happens on a lift or ramps with the rear section dropped, though cutting the old rusty pipe is part of the job. The warranty covers a one-time replacement for manufacturing defects but not labor or shipping. Expect light surface rust on 409 stainless within a couple of years; it looks rough and rarely turns into a leak.

Pros

• Direct fit for listed G35 and G37 model years
• Ships with clamps and gaskets included
• 409 stainless resists corrosion in harsh conditions
• Reduced back pressure can add horsepower and torque

Cons

• Warranty excludes labor and shipping on replacements
• Installed or modified parts are non-returnable

12. Northeastern Exhaust Y-Pipe for 2009-2013 Infiniti G37 3.7L

This Y-pipe replaces a corroded stock section on a 2009-2013 Infiniti G37 3.7L coupe. It suits G37 drivers who need a direct replacement without welding or custom pipe bending. Matching the OEM part number 50362 and bolting straight into place is its single biggest strength.

Setup is a one-visit job for a certified mechanic, since it installs as a straight replacement with no fabrication of new pipes involved. The box includes the bolts, nuts, and gasket that seal the joints. The safety notes deserve attention: every connection needs a leak check after the install, and the tailpipe must extend beyond the body so exhaust gases cannot enter the cabin.

Past that, the pipe asks nothing from you.

The pipe reduces back pressure to improve exhaust flow, which can lift horsepower and torque, framed as potential rather than guaranteed. The 409 grade stainless steel shrugs off road salt and winter moisture, the two things that rot exhaust tubing fastest. Ratings hold a perfect 5.0, though only 4 reviews support that score, so the track record is short.

The clearest complaint comes from the substitution policy, since the seller may ship an equivalent part instead of this exact one.

Day-to-day, this y-pipe bolts between the exhaust sections of a 2009-2013 G37 3.7L, and the gaskets and clamps come in the box, so a shop can complete the swap without welding. The 409 stainless steel shrugs off road salt and wet winters, the design trims back pressure, and it carries a perfect 5.0 average across four ratings.

G37 sedan and coupe drivers replacing a corroded or rattling factory y-pipe will appreciate the bolt-in design, the included gaskets and clamps, and the price gap versus a dealer unit. Shoppers chasing guaranteed horsepower should choose a mandrel-bent performance y-pipe instead, and anyone wanting a mirror-polished show piece should consider 304 stainless alternatives.

Check part number 303130 or OEM reference 50362 against your car first, since Northeastern Exhaust may ship an equivalent part if this one becomes unavailable. Let a certified mechanic handle the install, then check for leaks and confirm the tailpipe exits beyond the body. On that basis, it makes a strong best exhaust G37 coupe shortlist pick.

Pros

• Bolts in place with no welding required
• Ships with bolts, nuts, and a matching gasket
• 409 stainless steel stands up to corrosion
• Matches OEM part 50362 for direct fitment

Cons

• Equivalent part may ship instead of the exact item
• Just 4 reviews, so long-term feedback is thin

G37 Coupe Exhaust Comparison Side by Side

How to Choose the Right Exhaust for Your G37 Coupe

Focus on fitment first, since a direct bolt-on system uses factory mounting points and saves you a shop visit for cutting and welding. Stainless steel piping resists rust through wet winters. Check for drone at highway speed, because a loud cabin gets old fast on a daily driver.

Fitment with Your Coupe

A sedan catback looks close enough to fool you in photos, but the hanger spacing is different, and the tips end up sitting crooked or too far out under the coupe’s rear bumper. Every listing that matters states 2008 to 2013 G37 coupe clearly, so read past the fits G37 headline before you click buy.

Check the drive type note before buying. On the AWD car the driveshaft runs closer to the midpipe on some designs, and a system patterned after the rear wheel drive car can rub or need cutting to clear. That note usually hides in the description, not the title.

The last check is the midpipe connection. Most catbacks slip over the stock y-pipe and clamp down, so installation is an afternoon job with hand tools.

Some 3-inch systems assume an aftermarket midpipe is already in place, and pairing one with a stock setup leaves a gap at the slip joint. Confirm the diameter matches whatever you run now before ordering.

Sound and Drone

The VQ37 spins close to 3,000 rpm at 75 mph in top gear, and that cruise band is exactly where a badly matched system drones the loudest. Plenty of setups sound perfect during a parking-lot rev and then buzz through an entire 40-minute freeway commute.

Resonated and muffler-backed systems keep the cabin civil: a deep note when you get on it, quiet enough for phone calls at 75. Straight-through designs get properly loud, and you pay for that between 2,500 and 3,500 rpm, right where the engine sits on any long trip. Judge a system at steady cruise, not idle blips.

Valved setups split the difference with a quiet mode for the weekday drive and an open mode for weekend runs. The trade is price, noticeably higher than a fixed design, plus a solenoid that adds one more thing to fail down the road.

Stainless Grade and Welds

A 409 stainless kit in a salt-belt driveway starts showing surface rust at the hangers and a steady brown cast by the second or third winter. 304 stainless carries the same salt and still looks bright years in, which matters when the rear valance shows half the muffler on a coupe.

Check the bends next. Mandrel bends hold full pipe diameter through a corner, while crush bends flatten the tube and choke flow on the sweep over the rear axle.

A crushed section there adds rasp and can dull midrange pull, so confirm mandrel bending in the specs before you pay.

Welds tell you the rest. Zoom into the listing photos at the muffler inlets, the tip joints, and the O2 bungs. Even, stacked bead rings signal careful work; thin, lumpy beads with gaps are where cheap systems crack first, and that leak turns every cold start into a drone you hear from inside the house.

Pipe Diameter and Power

A full 3 inch system bolted to a mostly stock G37 tends to feel lazier below 3,000 rpm than a 2.5 inch setup. The reason is exhaust gas velocity: 2.5 inch piping keeps flow speed up, which preserves the low and midrange torque you use around town.

The bigger diameter mainly pays off with a supercharger or a heavy bolt-on build that moves enough air to fill the pipe.

Catback gains alone are modest on a naturally aspirated car, often a few horsepower. The numbers grow when the same catback runs behind a high-flow midpipe and gets a tune, because that combination opens the whole path instead of choking it at the factory cats.

Tips are the sizing detail people forget. Measure the rear valance cutout before ordering, since 4.5 inch rolled tips can sit proud of the bumper and throw off the rear view when you glance back at the car.

A 4 inch or 3.5 inch tip usually fills the opening without sticking past the bodywork.

Installation and Hardware

A flanged bolt-on system goes up in a driveway on jack stands with hand tools, no cutting required. A cut-and-weld fit needs a lift, a chop saw, and a welder, plus a shop bill to match.

Open the box before the stock exhaust comes down. A complete kit includes new band clamps, both flange gaskets, and all the hanger hardware.

The stock bolts on a ten-year-old car usually snap or round off on the first pull, and a snapped stud turns an afternoon job into a week of waiting on parts.

Hangers settle how the tips sit. Slotted or adjustable hanger rods let you move a tip a quarter inch after it hangs crooked, saving the clamp-loosening ritual.

Fixed brackets rarely cooperate; one tip ends up higher unless you persuade the bracket with a pry bar and a block of wood.

How to Reduce Highway Drone After Installing an Aftermarket Exhaust

Most aftermarket G37 exhausts drone hardest between 2,000 and 3,000 rpm, right where the engine sits during steady highway cruising. That hum comes from a pressure wave at one narrow frequency, and you can cancel or absorb it without losing the note you paid for.

• Add a mid-pipe resonator. An 18 to 24 inch bottle resonator welded into the mid-pipe kills drone more than any other change, and it only dulls the tone slightly.
• Try a tuned tube. A quarter-wave resonator off the mid-pipe targets the exact frequency where drone peaks, with almost no effect on volume.
• Deaden the cabin. Butyl mats on the trunk floor and rear quarter panels absorb the boom a coupe body loves to amplify.
• Fix leaks first. A worn flange gasket or loose clamp hums exactly like drone, so torque the clamps and inspect the gaskets before buying anything.

A resonator plus trunk mats keeps most setups comfortable, and you still hear the car open up under throttle.

Common Installation Mistakes That Cause Exhaust Leaks and Check Engine Lights

Most exhaust leaks on a G37 coupe trace back to the flanges, not the new pipe. The Y-pipe and mid-pipe meet at a two-bolt flange with a metal crush gasket, and that gasket is designed to flatten once. Reusing an old one is the most common reason a fresh install still hisses at startup and later throws a rear O2 sensor code.

• Old crush gaskets. Buy a new set with the exhaust; they cost a few dollars each.
• Uneven flange bolts. Snug both bolts before torquing so the flange sits flat.
• Off-center band clamps. Position the clamp over the full joint before tightening, or it can slide under load.
• Grease near a sensor bung. Anti-seize goes on the threads only, never on the sensor tip.
• Loaded hangers. Leave every connection loose until the exhaust hangs square, then work front to back.

Recheck the bolts after one drive. Heat cycles compress the new gaskets slightly, and a quick retorque keeps the light off.

Cleaning and Protecting Exhaust Tips Through Winter Road Salt

Cleaning and Protecting Exhaust Tips Through Winter Road Salt

Salt spray rides the slipstream to the rear of the car, dries on the tips overnight, and can pit polished stainless and chrome within a single winter. The factory tips on the G37 coupe hold up fine with regular washing, but mirror-polished aftermarket tips show rust freckles fast when they sit dirty.

• Rinse before you touch. Flush the rear bumper and tips with plain water first so grit never gets scrubbed into the finish.
• Wash weekly in salt season. Car shampoo, warm water, and a microfiber cloth kept just for metal.
• Dry right away. Standing water around the outlet is what leaves that white mineral ring.
• Polish and seal monthly. Metal polish lifts the haze, then a thin coat of wax or sealant stops meltwater from bonding to the surface.

Black ceramic and burnt titanium finishes hide salt residue better, so the weekly rinse does most of the work on them. Skip anything with cleaning solvents near chrome, because leftover spray dulls the shine you just polished back.

People Also Asked

Will a G37 Coupe Exhaust from One Model Year Fit Another?

Any exhaust made for a G37 coupe fits every coupe model year from 2008 through 2013, and the later Q60 coupe up to 2015 as well, because the underbody never changed. Sedan and convertible exhausts will not bolt up, so avoid listings that blur those body styles. Check the hanger brackets and the flange where the mid-pipe meets the axle-back for rust before buying used.

How Do I Measure the Inlet Diameter Before Ordering Exhaust Tips?

Measure the outer diameter of the tailpipe where the tip will clamp, since tips slide over the pipe rather than inside it. Calipers give the cleanest reading, but a tape wrapped around the pipe and divided by 3.14 works too. Measure an inch or two behind the muffler outlet, because pipe diameter can change at bends or welded sections, and check it with the engine cold.

How Long Does a Stainless Cat-Back Exhaust Last on a G37?

A quality stainless cat-back on a G37 usually lasts 10 to 15 years, often outliving your ownership of the car. The 304 stainless tubing resists rust, but the clamps, hangers and flange gaskets tend to fail first. After a few salty winters, check those joints underneath and retorque the clamps. Cheaper 409 stainless versions can rust through in five years or so.

Why Does My Aftermarket Exhaust Drone on the Highway at Cruise?

Drone happens because your larger piping and deleted or straight-through mufflers resonate at the engine’s cruise frequency, around 1,800 to 2,200 rpm where a G37 sits in top gear. A mid-pipe resonator or glasspack added behind the mid-pipe usually cuts most of it. Helmholtz-style J-pipes work too. Chambered mufflers run quieter on cruise than straight-through designs.

Can I Install a Full Exhaust in My Driveway Without a Lift?

You can do a full exhaust on an Infiniti G37 coupe with jack stands, hand tools and a couple of hours. The axleback and midpipe bolt up with basic wrenches. The Y-pipe flange nuts often seize, so soak them in penetrating oil the night before. A second set of hands helps align the midpipe while you start the bolts.

Conclusion

Sound comes first, because you live with it every drive. Cat-back systems change the tone more and cost more; axle-backs stay cheap and mostly swap the tips.

Material matters next. Mild steel rusts out within a few winters, while 304 stainless lasts as long as the car does.

Before you order, match the exhaust to how you actually use the car. A daily commuter will notice highway drone far more than a weekend coupe ever will. Check the comparison table, line it up with your budget, and one of the picks above will fit.