GReddy 09-17 Nissan 370Z Evolution GT Full Dual Cat-Back Exhaust

Dual Muffler Cat-Back Power for the 2009 through 2017 Nissan 370Z VQ37HR

The GReddy 10128303 EVOlution GT Full Dual Cat-Back Exhaust is the complete bolt-on exhaust upgrade for the 2009 through 2017 Nissan 370Z Z34 chassis with the VQ37HR 3.7L V6 engine. Dyno-proven at gains of 16 wheel horsepower and 19 ft-lbs of torque on a stock naturally aspirated 370Z, the GReddy 10128303 delivers substantially more with forced induction. The system progresses from a dual 2.5-inch Y-pipe that transitions into a 3-inch X-pipe crossover, through dual resonators for exhaust pressure equalization and sound control, into dual EVOlution GT muffler canisters angled specifically to clear the factory EVAP canister and fit within the Z34 body lines. Single-wall slash cut 115mm tips finish the system under the factory rear bumper cutouts. The GReddy EVOlution 10128303 is fully hand-welded from T304 stainless steel and carries GReddy's Limited Lifetime Warranty. No EVAP relocation is necessary. Note: not compatible with Nismo bumper.

Key Features

• Dyno-Proven Power Gains: 16 whp and 19 ft-lbs on a stock N/A 370Z, with greater gains expected on turbocharged builds.
• 2.5 inch to 3 inch Dual Piping: Dual 63.5mm Y-pipe transitions to a 76mm X-pipe crossover for broad power delivery across the VQ37 RPM range.
• Dual Resonators: Two inline resonators equalize exhaust pressures and tune the sound note for a deep, refined tone rather than drone.
• Dual EVOlution GT Mufflers: High-flow straight-through internals inside compact, angled canisters optimized for the 370Z rear body line.
• 115mm Single-Wall Slash Tips: GReddy laser-engraved tips sit correctly under the factory bumper cutouts.
• No EVAP Relocation: System is designed to clear the factory EVAP canister without relocation.
• T304 Stainless Steel: Full hand-welded 304 stainless construction throughout for corrosion resistance and long-term durability.
• Limited Lifetime Warranty: GReddy covers this system with their Limited Lifetime Warranty.

What's Included

• GReddy 10128303 EVOlution GT full dual cat-back exhaust system (4 pieces)
• Dual 2.5 inch to 3 inch Y-pipe section
• 3 inch X-pipe crossover with dual inline resonators
• Dual EVOlution GT muffler canisters with 115mm slash tips
• 3.0 inch oval gaskets (3 included)
• Mounting hardware and installation hardware

Specifications

This Part Fits

Important: The GReddy 10128303 is NOT compatible with the Nismo bumper. If your 370Z has a factory or aftermarket Nismo front bumper, the tip placement will conflict with the bumper cutouts.

Frequently Asked Questions

• Q: How much horsepower does the GReddy 10128303 add to my 370Z?
  A: GReddy dyno-tested the 10128303 on a stock naturally aspirated 370Z and recorded gains of 16 wheel horsepower and 19 ft-lbs of torque. Turbocharged 370Z builds will see greater gains due to the improved exhaust flow.
• Q: Does the GReddy 10128303 fit the Nismo 370Z?
  A: No. The GReddy 10128303 is not compatible with the Nismo bumper. The tip geometry is designed for the standard factory rear bumper cutouts and will not align properly with the Nismo bumper opening.
• Q: Do I need to relocate the EVAP canister to install the GReddy 10128303?
  A: No. GReddy specifically designed the 10128303 muffler canister angle to clear the factory EVAP canister. No EVAP relocation is necessary.
• Q: What does the GReddy 10128303 sound like?
  A: GReddy measured 99 to 100 dB(a) at 4500 RPM. The dual resonator design produces a deep, aggressive VQ note with reduced drone compared to non-resonated systems. The X-pipe crossover adds a throaty scavenging tone at higher RPM.
• Q: Will the GReddy 10128303 fit a turbocharged 370Z?
  A: Yes. GReddy specifically notes the 10128303 is ideal for turbocharged VQ37 builds. The 3-inch X-pipe diameter handles the increased exhaust flow from forced induction without restriction.
• Q: Is the GReddy 10128303 a cat-back or does it replace the catalytic converter?
  A: The 10128303 is a full cat-back system. It connects after the factory catalytic converters and front pipe. The factory cats and front pipe are retained.
• Q: Does the GReddy 10128303 require a tune after installation?
  A: A tune is not required for this cat-back system, though a professional calibration is always recommended after any exhaust modification to optimize fuel trims and maximize power output.
• Q: What warranty does GReddy provide on the 10128303?
  A: GReddy covers the EVOlution GT exhaust system with a Limited Lifetime Warranty against defects in materials and workmanship. Under the Magnuson-Moss Warranty Act, installing this cat-back exhaust cannot void your vehicle's factory powertrain warranty unless a dealer proves the exhaust directly caused the specific failure being claimed.
• Q: How many pieces is the GReddy 10128303 system?
  A: The complete 10128303 system is a 4-piece kit including the dual Y-pipe, X-pipe crossover, and dual muffler canisters with tips.

Installation Notes

• Cat-back system connects after factory front pipe and catalytic converters. No front pipe or cat modification required.
• 4-piece system. Follow GReddy installation sequence: Y-pipe first, then X-pipe, then muffler canisters.
• 3.0 inch oval gaskets included (qty 3). Replace factory gaskets at mating flanges for a leak-free seal.
• Allow exhaust system to cool completely before installation if working on a vehicle that has recently been driven.
• Use penetrating oil on factory exhaust hangers and hardware before removal to prevent breakage.
• Do not fully tighten any clamps or hangers until the full system is loosely assembled and aligned to verify tip position relative to bumper cutouts.
• Professional installation recommended for optimal tip alignment and hanger positioning.

California Prop 65 Warning: This product can expose you to chemicals including nickel and chromium compounds known to the State of California to cause cancer and reproductive harm. For more information, visit www.p65warnings.ca.gov.