STILLEN 2009-2020 Nissan 370Z Cat Back Exhaust [Z34]

The STILLEN Cat-Back Exhaust System for the Nissan 370Z [Z34] is engineered to deliver maximum horsepower, torque, and sound quality without introducing unwanted drone. Designed as a complete replacement for the factory exhaust, this system features mandrel-bent 304 stainless steel piping, optimized exhaust routing, and polished 4.5” dual-wall stainless steel tips exiting through the factory exhaust locations.

STILLEN utilizes a true dual exhaust configuration to improve exhaust scavenging. By efficiently pulling exhaust gases through the system using pressure pulses, backpressure is reduced and overall engine efficiency is increased. The result is a dyno-proven gain of up to 18 wheel horsepower and 15 lb-ft of torque, while maintaining excellent drivability and cabin comfort.

This cat-back system bolts directly to the factory mounting points and includes a mandrel-bent Y-pipe and mid-pipe, ensuring smooth exhaust flow from start to finish. Designed for aggressive performance driving, the STILLEN 370Z exhaust delivers a deep, refined tone at cruise and a powerful, commanding sound when pushed.

Vehicle Fitment

Nissan

• 2009–2020 Nissan 370Z [Z34] - Base, Touring, Sport

Fitment Notes

• Direct bolt-on replacement for factory exhaust
• Compatible with factory exhaust cut-outs
• Functions as a full replacement for the factory 370Z exhaust system
• Also compatible as a replacement for OEM-style dual exhaust layouts

Features & Benefits

• Up to 18 WHP Increase at the Wheels*
• Up to 15 lb-ft Torque Gain*
• Aggressive Performance Tone Without Annoying Drone
• Improves exhaust scavenging for increased efficiency
• 304 Stainless Steel Construction for Long Service Life
• Mandrel-Bent Piping for Maximum Exhaust Flow
• Polished 4.5” Dual-Wall Stainless Steel Tips
• Compliments factory exhaust cut-out design
• Complete Cat-Back Exhaust System
• Bolt-On Installation – No Fabrication Required
• Easy to install
• Limited Lifetime Warranty

*Results May Vary

Construction & Design

The STILLEN 370Z exhaust system is constructed entirely from 304 stainless steel, ensuring durability, corrosion resistance, and long-term reliability. Mandrel-bent tubing maintains consistent diameter throughout the exhaust path, minimizing turbulence and maximizing flow.

The large 4.5” dual-wall polished tips enhance the rear appearance of the 370Z while delivering a bold exhaust note without excessive noise or drone during highway cruising.

Why STILLEN

Since 1986, STILLEN has been a leader in Nissan and Infiniti performance development. Founded by racing legend Steve Millen, STILLEN’s close relationship with Nissan and NISMO has resulted in championship-winning race cars, record-setting builds, and factory-backed performance programs.

By focusing on a limited number of platforms, STILLEN engineers are able to extract the highest level of performance, quality, and reliability from every product—making STILLEN the benchmark for Nissan Z performance upgrades.