ISR Performance Stainless Steel High Flow Cats – Bolt-On Upgrade for Nissan 350Z Z33 & Infiniti G35 V35 VQ35DE 2003-2007
Upgrade your VQ35DE-powered Nissan 350Z and Infiniti G35 with ISR Performance’s Stainless Steel High Flow Cats, engineered to deliver less restriction than stock while still converting harmful exhaust gases for a perfect balance of power gains and improved sound. These HFCs are custom made using Magnaflow 300-cell spun metallic substrate and are fully TIG welded with true mandrel bends throughout for maximum flow, durability, and long-lasting corrosion resistance. The 2.5” piping bolts directly to factory or aftermarket exhaust systems built to OEM specs, retains the factory oxygen sensor locations, and includes O2 extension pipes to prevent check engine lights, giving you a deeper, more aggressive exhaust tone with quicker throttle response and a noticeable bump in horsepower. Fitment covers the Z33 Nissan 350Z from 2003-2006 with the VQ35DE non-HR engine, including Base, Enthusiast, Touring, Grand Touring, Track, and 35th Anniversary trims in both coupe and convertible configurations, as well as the V35 Infiniti G35 from 2003-2007 for Base and Sport coupe models, and Base and X AWD sedan models from 2005-2007. Each kit comes with 2x stainless steel high flow cats, 2x 2-bolt and 2x 3-bolt exhaust gaskets, and 2x O2 sensor extension pipes for a straightforward bolt-on installation that works with both OEM and aftermarket cat-back systems. Designed for off-road and competition use only, these cats are a proven way to free up your VQ35DE’s breathing, improve exhaust scavenging, and give your 350Z or G35 the sound and performance it deserves without sacrificing build quality.
Key Features:
- Magnaflow 300 Cell Metallic Substrate: Uses a high-flow 300-cell spun metallic core that reduces restriction compared to stock cats while still maintaining proper exhaust gas conversion.
- Full TIG Welded Construction : Every unit is precision TIG welded with true mandrel bends to ensure maximum flow, strength, and leak-free durability under high heat.
- Stainless Steel Build : Constructed from high grade stainless steel for superior corrosion resistance and long-term durability in daily driving and track conditions.
- Direct Bolt-On Fitment: Designed to bolt directly to OEM or aftermarket exhaust systems built to OEM specs for the Z33 350Z and V35 G35, no cutting or welding required.
- Retains OEM O2 Sensor Locations : Keeps factory oxygen sensor placement intact and includes O2 extension pipes to prevent check engine lights on most setups.
- Aggressive Exhaust Tone : Frees up exhaust flow to produce a deeper, more aggressive note with improved throttle response and reduced rasp.
- VQ35DE Compatibility : Specifically engineered for 2003-2006 Nissan 350Z and 2003-2007 Infiniti G35 models with the VQ35DE non-HR engine.
- 2.5” Mandrel Bent Piping : Uses 2.5” mandrel bent tubing throughout to maintain optimal exhaust velocity and minimize turbulence.
- Complete Hardware Included : Kit comes with 2x high flow cats, 2x 2-bolt gaskets, 2x 3-bolt gaskets, and 2x O2 extension pipes for a full bolt-on install.
- Improved Performance : Reduces exhaust backpressure to help unlock horsepower and torque gains while improving overall engine efficiency and response.