Y-Pipe Downpipe Exhaust for 03-09 Nissan 350Z 3.5L 2005,2007 Infiniti G35 | SPELAB

Who This Is For

2003-2009 Nissan 350Z and 2005-2007 Infiniti G35 owners with the 3.5L VQ35DE V6 who want a 2.5"→3" Y-pipe for the naturally-aspirated VQ. The 350Z/G35 is naturally aspirated — there is no factory turbocharger, so this is technically a Y-pipe / test pipe.

Key Features

• 2.5" inlet to 3" outlet for optimal flow
• T-304 stainless steel with double-welded flex pipe
• Instant 10-20 HP gain
• Direct bolt-on to factory exhaust
• Includes flex pipe for vibration isolation

Product Specifications

• Engine: Nissan VQ35DE 3.5L V6
• Inlet Side: 2.5 inch
• Outlet Side: 3.0 inch (Allowable Error range: 0.1-0.3 inch)
• Material: T-304 Stainless Steel
• Surface: Mirror Polish
• Configuration: Catless (Y-pipe / test pipe replacement)
• Flange Type: Bolt-on (4-Bolt) + V-Band
• Weight: 6.40 kg (6400 g)

What's Included

• Y-pipe with flex
• Gasket(s)
• Mounting hardware

Check Before Choosing

• Naturally aspirated: The 350Z/G35 is a naturally-aspirated V6 — there is no factory turbocharger. This is a Y-pipe / test pipe replacement.
• No tuning needed: Naturally aspirated engine — no tuning required.
• Power claim: 10-20 HP gain (manufacturer claim). Actual results depend on supporting mods.
• VQ rasp / hiss: Removing the catalytic converter can introduce VQ "rasp" at high RPM. Consider pairing with a resonated mid-pipe.
• Street legality: Off-road / race use only. Check local laws.

Vehicle Fitment

Compatible vehicles: Nissan 350Z and Infiniti G35 (2003–2009).

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 350Z is naturally aspirated. This is a Y-pipe / test pipe replacement for the factory exhaust system.

How much power will I gain?

10-20 HP (manufacturer claim). Actual results depend on supporting mods.

Do I need a tune?

No — the VQ35DE is naturally aspirated. No tuning required.

Is it street-legal?

Off-road / race use only. Check local laws.