370Z and G37 Y-Pipe Downpipe Exhaust Upgrade
The factory Y-pipe on the VQ37VHR is built around emissions compliance and cabin comfort — not flow. Its cramped merge design restricts exhaust velocity right where both cylinder banks come together, blunting mid-range response and muffling the V6 tone this platform was born to deliver.
This Flashark 2.5-inch-to-3-inch stainless Y-pipe replaces that restrictive merge with a smoother, larger-volume section that helps exhaust gases exit faster through the mid-to-upper RPM range. It adds a welded flex joint for vibration isolation and ships with gaskets and hardware for a bolt-on install. Expect a deeper, more aggressive VQ37 tone and sharper throttle response — especially when paired with test pipes, headers, or a cat-back system. Estimated 10-15 HP with ECU tune as part of a full exhaust build.
OFF-ROAD USE ONLY
This product is designed for off-road and track use only. Removing or bypassing factory catalytic converters violates the federal Clean Air Act (42 U.S.C. § 7401) and may result in fines, failed emissions inspections, or registration denial. Some combo variants include test pipes that replace catalytic converters — these are NOT legal for street use in emissions-regulated states. Check your local regulations before purchasing. By ordering, you accept full responsibility for compliance.
Specifications
| Brand |
Flashark |
| Product Type |
Y-pipe downpipe exhaust section |
| Material |
Stainless steel |
| Finish |
Polished stainless finish |
| Inlet Diameter |
2.50 inches |
| Outlet Diameter |
3.00 inches |
| Piping |
2.50 inch piping with welded flex section |
| Engine Platform |
VQ37VHR 3.7L naturally aspirated V6 |
| Estimated Gain |
Supports an estimated 10-15 HP and 5-10 ft-lbs of torque depending on the full exhaust setup, tune, engine condition, and installation quality. |
| Included Items |
Y-pipe, gaskets, nuts, and bolts |
Key Features
Smoother VQ37 exhaust merge — Replaces the factory Y-pipe's cramped junction with a freer-flowing 2.5"→3.0" design that reduces back-pressure at the critical merge point where both cylinder banks converge
Deeper, more aggressive exhaust tone — Opens up the VQ37VHR's natural V6 character; sound level depends on your full exhaust configuration (test pipes, cat-back, resonators)
T-304 stainless construction — High-grade stainless built for sustained exhaust heat, corrosion resistance, and long service life
Polished stainless finish — Clean appearance under the car; resists surface discoloration from heat cycling better than raw or painted finishes
Welded flex section — Absorbs drivetrain and chassis movement to reduce flange stress and prevent fatigue cracks at the merge welds
2.5" inlets / 3.0" outlet — Matches factory front pipe outlet diameter (2.5") while stepping up to 3.0" at the merge for improved downstream flow velocity
Bolt-on installation — Direct-fit replacement for the factory Y-pipe section on RWD 370Z and G37 models; includes gaskets, nuts, and bolts
Foundation for full exhaust build — Pairs with Flashark test pipes, headers, and cat-back systems for a complete VQ37VHR exhaust upgrade path
Built for Better Flow and Sound
The Y-pipe is one of the main merge points in the 370Z and G37 exhaust path. It brings exhaust flow from both sides of the VQ37 engine together before the system continues toward the rear exhaust section.
Replacing the factory-style Y-pipe with a freer-flowing stainless section can help sharpen throttle response, deepen the exhaust tone, and support better pull through the upper rpm range. This is not a turbo downpipe upgrade because the 370Z and G37 VQ37VHR platform is naturally aspirated.
Complete Your Performance Build: For the ultimate sound and power gains, pair this high-flow Y-pipe with our 3-Inch Single Tip Cat-Back Exhaust for 2009-2020 Nissan 370Z.
Who This 370Z and G37 Y-Pipe Is Best For
This Y-pipe downpipe exhaust is best for Nissan 370Z and Infiniti G37 RWD owners who want a sharper exhaust response, a deeper VQ37 tone, and a stronger foundation for future exhaust upgrades. It works well for drivers who are building around better exhaust flow rather than looking for a quiet factory-style replacement.
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370Z Z34 owners: Drivers with listed 2009-2016 Nissan 370Z models who want a freer-flowing Y-pipe section for the VQ37VHR platform.
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G37 RWD Coupe or Sedan owners: Infiniti G37 owners with listed RWD fitment who want better exhaust merge flow without replacing every exhaust section at once.
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Performance-focused builds: A good match for owners pairing the Y-pipe with compatible headers, test pipes, or a cat-back exhaust for a fuller VQ37 exhaust setup.
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Drivers who want more sound: Best for users who prefer a deeper, more noticeable exhaust tone compared with the factory Y-pipe.
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Off-road or track-use buyers: Suitable for performance builds where local rules allow exhaust modifications and the owner understands emissions limitations.
This part is not the right choice for G37X or AWD models, buyers who need a guaranteed emissions-compliant replacement, or drivers who want the quietest possible factory-style exhaust. If your car already has custom exhaust work, confirm flange location, pipe diameter, and drivetrain fitment before ordering.
Stock Y-Pipe vs Flashark Y-Pipe
| Area |
Factory Y-Pipe |
Flashark Y-Pipe |
| Exhaust Flow |
Designed around factory comfort and emissions priorities |
Designed to reduce restriction and support smoother exhaust movement |
| Sound |
Quieter and more restrained |
Deeper and more noticeable, depending on the full exhaust setup |
| Material |
Factory material varies by vehicle age and condition |
Stainless steel tubing with polished finish |
| Performance Support |
Limited by the stock exhaust merge design |
Supports an estimated 10-15 HP and 5-10 ft-lbs of torque with the right setup |
| Best Use |
Factory-style comfort and replacement use |
Performance, off-road, track, or modified builds where permitted |
How This Y-Pipe Fits the VQ37 Exhaust Path
Many 370Z and G37 owners search for this part using terms like Y-pipe, downpipe, test pipe, front pipe, or Z34 Y-pipe exhaust. On this platform, the Y-pipe is the merge section that connects the front exhaust path to the rear exhaust system.
This listing includes selectable package options, so the exact parts you receive depend on the variant chosen before checkout. The base Y-pipe option includes the Y-pipe section with gaskets and hardware. If you need headers, test pipes, or a full cat-back setup, select the matching package carefully and confirm the product images and option name before ordering.
What Is Included
- 1 x Y-pipe exhaust section
- Gaskets
- Nuts and bolts
- Selected variant components if you choose a larger package option
Professional installation is recommended. Exhaust age, rusted factory hardware, previous modifications, and flange alignment can affect installation time.
Delivery, Return, and Protection
DELIVERY: Free Shipping. Estimated in 3-5 Working Days.
Fast Shipping Policy: Your order will be dispatched within 1-2 business days, and the package will arrive within your order's estimated date.
Easy Return Policy: Every order comes with a 14-day free return, provided the item is brand new, uninstalled, and in its original packaging. We cover return shipping for quality issues. Refunds are processed within 3-5 business days.
Worry-Free Delivery Protection: Add Worry-Free Delivery at checkout — if it's lost, stolen, or damaged, you're 100% covered.
| Years |
Make |
Model |
Engine |
Notes |
| 2009-2016 |
Nissan |
370Z Z34 (RWD) |
VQ37VHR 3.7L V6 |
All trims: Base, Touring, Sport, NISMO (2017-2020 NOT compatible — see below) |
| 2008-2013 |
Infiniti |
G37 Coupe V36 (RWD) |
VQ37VHR 3.7L V6 |
All RWD trims |
| 2009-2015 |
Infiniti |
G37 Sedan V36 (RWD) |
VQ37VHR 3.7L V6 |
Includes 2014-2015 continuation models alongside Q50 |
| 2009-2013 |
Infiniti |
G37 Convertible V36 (RWD) |
VQ37VHR 3.7L V6 |
All RWD convertible trims |
Pro Tip: Confirming Your Exhaust Layout
Before ordering, check what's currently on your car:
- Still on factory exhaust? — This Y-pipe is a direct bolt-on replacement
- Already have test pipes or aftermarket front pipes? — Verify flange diameter (2.5") and position matches
- Already have an aftermarket cat-back? — Confirm your mid-pipe inlet diameter matches the 3.0" Y-pipe outlet
- G37X/AWD owner? — Do NOT order this part; AWD models have completely different exhaust routing
Q: Is this a Y-pipe, a downpipe, or a test pipe?
A: The base product is a Y-pipe — the merge section where exhaust from both banks of the VQ37VHR V6 combines into a single pipe before continuing to the mid-pipe and cat-back. On turbo cars, "downpipe" means the pipe after the turbo. On the NA VQ37VHR, the equivalent front section is called a "front pipe" or "test pipe" (if catless). Some buyers search "downpipe" for any front exhaust upgrade, so the listing uses that term for discoverability. The combo variants include both the test pipes (front section) and this Y-pipe (merge section). Check your selected variant before ordering.
Q: Does this Y-pipe fit the Nissan 370Z?
A: Yes, this Y-pipe is designed for 2009-2016 Nissan 370Z Z34 RWD models with the VQ37VHR 3.7L V6 — including Base, Touring, Sport, and NISMO trims. Important: this does NOT fit 2017-2020 370Z models — the exhaust layout was revised for later production years. Confirm your model year and current exhaust configuration before ordering.
Q: Does this fit the Infiniti G37 Sedan?
A: Yes, for 2009-2015 Infiniti G37 Sedan V36 RWD models with the VQ37VHR. Note: the G37 sedan continued through 2014-2015 as a lower-cost option alongside the Q50, and those later models still use the same VQ37VHR and exhaust layout. This does NOT fit G37X or AWD models — the exhaust routing is completely different.
Q: Does this fit the Infiniti G37 Coupe?
A: Yes, for 2008-2013 Infiniti G37 Coupe V36 RWD models. The coupe launched in 2008 with the VQ37VHR and shares the same exhaust merge layout as the sedan and 370Z (all RWD versions). Not compatible with AWD variants.
Q: Will this make my 370Z or G37 louder?
A: Yes — replacing the factory Y-pipe with a freer-flowing merge section will deepen the exhaust tone and increase volume, especially in the mid-to-upper RPM range. The final sound level depends on your full exhaust setup: test pipes, resonators, muffler design, and cat-back configuration all contribute. A Y-pipe alone with the rest of the factory exhaust will be moderately louder; paired with test pipes and a non-resonated cat-back, it will be significantly more aggressive.
Q: Will this cause rasp or drone?
A: Rasp and drone depend on your complete exhaust combination, not just the Y-pipe. The Y-pipe changes the merge character and mid-range tone. High-RPM rasp is more commonly caused by test pipes or non-resonated mid-pipes. Cabin drone is more related to muffler design and resonator presence. If you're concerned about drone, keep a resonated mid-pipe in the system.
Q: How much horsepower does this add?
A: The Y-pipe alone typically adds 5-8 HP on a stock-tuned VQ37VHR. As part of a full exhaust build (test pipes + Y-pipe + cat-back + ECU tune), estimated gains reach 10-15 HP with ECU tune. Gains depend on your complete exhaust configuration, tune quality, engine condition, and installation. The Y-pipe's main benefit is smoother merge flow and improved throttle response — not peak HP alone.
Q: Do I need a tune after installing this Y-pipe?
A: A standalone Y-pipe swap on an otherwise stock exhaust does not require a tune — the VQ37VHR's ECU can adapt to the modest flow change. However, if you're combining the Y-pipe with test pipes, headers, or a full cat-back, a tune becomes strongly recommended to optimize fuel mapping, throttle response, and rev limit behavior. Popular tuning options for VQ37VHR include UpRev/Nissan DataScan, Motec, and EcuTek.
Q: Will this trigger a check engine light (CEL)?
A: The Y-pipe alone does not relocate or delete any O2 sensors — the VQ37VHR's upstream and downstream O2 sensors are located in the front pipe section, not the Y-pipe. So a Y-pipe-only install should not trigger a CEL. However, if you're also installing test pipes (the combo variant), those replace the catalytic converters and will trigger P0420/P0430 catalyst efficiency codes unless you add O2 spacers or run an ECU tune that disables those monitors.
Q: Is this street legal?
A: The Y-pipe section itself does not remove catalytic converters — it replaces the merge section after the cats. In that narrow sense, a Y-pipe-only install may pass visual inspection in some jurisdictions. However, combo variants that include test pipes ARE catless and are NOT legal for street use in emissions-regulated states (CA, NY, etc.). This product is best treated as an off-road, track, or performance build component. Check your local emissions regulations before purchasing.
Q: Why doesn't this fit G37X or AWD models?
A: AWD models (G37X, G37XS) have a different underbody layout — the front driveshaft, transfer case, and differential occupy space that changes the exhaust routing and Y-pipe shape. The RWD Y-pipe will not clear the AWD components. AWD owners need a Y-pipe specifically designed for the X platform. Do not attempt to force-fit this part on an AWD car.
Q: What's the difference between this Y-pipe and test pipes?
A: They are completely different sections of the VQ37VHR exhaust. Test pipes (also called "front pipes" or "downpipe" in some search terms) are the upfront section between the headers and the Y-pipe — they replace the factory front pipes that contain the primary catalytic converters. The Y-pipe is the merge section that takes exhaust from both test pipes (or factory front pipes) and combines them into one pipe going to the mid-pipe and cat-back. You can install either one independently, or both together as a combo.
Easy Return Policy
Every order comes with a 14-day free return, provided the item is brand new, uninstalled, and in its original packaging. We cover return shipping for quality issues. Refunds are processed within 3-5 business days. Click for Return Policy
