Y Pipe Downpipe Exhaust for 2008-2016 Nissan 370Z Z34 / Infiniti G37 V36 VQ37VHR 3.7L

Fitment:

• 2009-2016 Nissan 370Z Z34 VQ37VHR
• 2008-2014 Infiniti G37 V36 VQ37VHR
• Fit with VG30DETT V6 Engine Models

 (Does NOT Fit with G37 X/ AWD Models) 

Q1: What Nissan and Infiniti models does this Y pipe fit?

A1: This Y pipe fits the 2008-2016 Nissan 370Z (Z34), 2008-2013 Infiniti G37 Coupe (V36), and 2009-2014 G37 Sedan. All variants use the VQ37VHR 3.7L V6 engine, which is what matters for fitment. The G35 (earlier generation) uses a different engine and won't work. Double-check whether your car is the coupe, sedan, or convertible, and confirm the year falls in this range.

Q2: What is a Y pipe and why does the 370Z/G37 need one?

A2: The VQ37VHR is a V6, which means exhaust gases come from two banks of cylinders that need to merge into a single exhaust path. The Y pipe does exactly that, collecting exhaust from both cylinder heads and feeding into a single pipe. The stock Y pipe has restrictive catalytic converters that choke power. An aftermarket Y pipe with better-flowing cats or no cats at all gives the turbo more room to breathe.

Q3: How much horsepower does the G37 Y pipe add?

A3: Real-world dyno results show 5-10 wheel horsepower gains with just a Y pipe upgrade. Some of the better-flowing options with high-flow cats hit the higher end of that range. The real gains come in throttle response and mid-range torque, especially above 5000 RPM where the VQ37VHR loves to rev. Combined with a tune and intake, you're looking at noticeable improvement across the entire powerband.

Q4: Do I need a tune for the 370Z Y pipe?

A4: If you're running high-flow catalytic converters, a tune isn't strictly necessary but is highly recommended. The stock ECU can adapt to slightly better flow. If you're going catless, you'll definitely need a tune to prevent check engine lights and maintain proper air-fuel ratios. The VQ37VHR responds well to tuning, and a proper tune will unlock more power from the modifications you're adding.

Q5: Catless vs high-flow cats for the G37 Y pipe?

A5: High-flow cats give you 80-90% of the power with full street legality. They're the smart choice for daily drivers who live in emissions testing states. Catless deletes give you the last 10-20% of power potential and an aggressive exhaust note, but you'll trigger check engine lights without a tune and fail emissions. For most enthusiasts, high-flow cats are the right call unless you're building a dedicated track car.

Q6: Is the 370Z Y pipe street legal?

A6: That depends on which version you buy. If you're running high-flow catalytic converters, it's usually street legal in all 50 states as long as the O2 sensors and emissions equipment remain functional. Catless versions violate federal emissions laws in the US and will fail California emissions testing. If you need to pass smog, stick with catted options. Some states don't test at all, so catless is effectively fine there.

Q7: What's the difference between the G35 and G37 Y pipe?

A7: The G35 uses the VQ35HR engine, which has different exhaust characteristics and piping requirements. The G37 and 370Z use the VQ37VHR with VVEL (Variable Valve Event and Lift) technology. The Y pipe flanges, diameters, and mounting points are different between generations. Make sure you're buying for the right car. G35 parts will not fit the G37, and vice versa.

Q8: Can I install the Y pipe myself on my 370Z?

A8: If you have basic mechanical skills and tools, it's doable in 3-4 hours. The hardest part is usually reaching the bolts with the engine in the bay. You'll need penetrating oil for the old hardware, new gaskets, and patience. The exhaust studs can be corroded and stubborn. Take pictures before disassembly so you remember sensor positions. A lift makes this significantly easier than working on the ground.

Q9: Will the Y pipe fit with my aftermarket headers?

A9: Most aftermarket headers for the VQ37VHR are designed to work with the standard Y pipe flange pattern. Check the header manufacturer's specifications to confirm they mate with your Y pipe. Some header kits include their own Y pipe or mid-pipe, which would make this part redundant. Get both parts and compare flanges before ordering to avoid fitment headaches.

Q10: Does the 370Z Y pipe affect exhaust sound?

A10: Yes, noticeably. The catalytic converters in the stock Y pipe act as silencers. Removing or upgrading them opens up the exhaust note significantly. Most drivers describe the sound as deeper and more aggressive, with a rasp that matches the V6's character. Combined with an axle-back or catback exhaust, the 370Z sounds like a completely different car. The exhaust note improvement is often why people do this mod before anything else.

Q11: What's the best supporting mods for the 370Z Y pipe?

A11: The Y pipe pairs perfectly with a cold air intake, catback exhaust, and a proper tune. The intake gives the engine more air to breathe, the Y pipe removes exhaust restriction, and the tune optimizes everything together. These three mods alone can add 20-30 wheel horsepower to a stock VQ37VHR. After that, you can consider headers, pulleys, and forced induction if you're chasing serious power.

Q12: How does the Y pipe affect the G37's fuel economy?

A12: In most cases, you won't notice a significant change in fuel economy. The engine might run slightly leaner without a tune if you go catless, but the differences are minimal for normal driving. If anything, the improved throttle response makes it easier to drive smoothly, which can offset any small efficiency loss. Hard-driven 370Z and G37 owners sometimes report better MPG because they're not revving the engine as hard to maintain speed.