Downpipe Exhaust for 2008-2018 Nissan 370z Infiniti G37 | SPELAB

Who This Is For

2008-2018 Nissan 370Z (Z34) and Infiniti G37 (V36) owners with the 3.7L VQ37VHR V6 who want a 2.5" to 3" Y-pipe downpipe for the naturally-aspirated VQ. The 370Z/G37 is a naturally-aspirated platform — there is no factory turbocharger, so this product is technically a Y-pipe / test pipe for the exhaust system.

Key Features

• 2.5" inlet to 3" outlet for optimal flow
• T-304 stainless steel construction with mirror polish
• Direct bolt-on to the factory exhaust system
• Mounting Style: 2-Bolt Y-Pipe Downpipe
• Mounting hardware included

Product Specifications

• Engine: Nissan VQ37VHR 3.7L V6
• Inlet Diameter: 2.5 inch
• Outlet Diameter: 3 inch
• Material: T-304 Stainless Steel
• Color: Metallic
• Shape: Round
• Mounting Style: 2-Bolt Y-Pipe
• Mounting Hardware Included: Yes
• Configuration: Catless (Y-pipe / test pipe replacement)
• Flange Type: Bolt-on (2-Bolt Y-Pipe)
• Weight: 4.38 kg (4380 g)

What's Included

• Y-pipe downpipe
• Gasket(s)
• Mounting hardware

Check Before Choosing

• Naturally aspirated: The 370Z/G37 is a naturally-aspirated V6 — there is no factory turbocharger. This is a Y-pipe / test pipe replacement, not a turbo downpipe.
• Fitment note (errata): ⚠ The listing states "Fit with VG30DETT V6" which is INCORRECT (VG30DETT is the 300ZX engine, not the 370Z). The correct fitment is VQ37VHR only. Verifies engine code before ordering.
• G37x / AWD exclusion: Does NOT fit G37 X / AWD models. RWD only.
• No tuning needed: Naturally aspirated engine — no tuning required.

Vehicle Fitment

Compatible vehicles: 2008-2018 Nissan 370Z and 2008-2013 Infiniti G37.

Installation Guide

Pre-Installation Checklist

• Confirm your engine code and model year match the fitment list above
• New gaskets and mounting hardware ready
• 22mm slotted O2 sensor socket + PB Blaster on hand (if applicable)
• Penetrating oil on hand for seized exhaust bolts

Installation Steps

1. Lift the vehicle and secure it on jack stands
2. Spray exhaust bolts with PB Blaster and let them soak for 30+ minutes
3. Remove the factory downpipe / Y-pipe section
4. Discard the old gasket and clean the mating surfaces
5. Install the new downpipe / Y-pipe with a fresh gasket
6. Tighten all bolts to factory torque spec
7. Start the engine and check for exhaust leaks

Installation Notes

• Never reuse the old gasket — it will cause an exhaust leak
• Verify all O2 sensor bungs are properly plugged or fitted with sensors
• Expect a more aggressive exhaust note and a slight drone change
• No tuning required for naturally-aspirated applications

FAQ

Is this a turbo downpipe?

No — the 370Z/G37 is naturally aspirated. This is a Y-pipe / test pipe replacement for the factory exhaust system.

Does it fit the G37x (AWD)?

No — this SKU is for RWD G37 only. G37x / AWD models use a different exhaust geometry.

Does it cause exhaust rasp?

Removing the catalytic converter can introduce VQ "rasp" at high RPM. Consider pairing with a resonated mid-pipe.

Is it street-legal?

Off-road / race use only. Check local laws regarding cat replacement.