ISR Performance Stainless Steel Test Pipes – Nissan 350Z Z33 / Infiniti G35

Unlock the full exhaust potential of your VQ35 with the ISR Performance Stainless Steel Test Pipes — a direct catalytic converter replacement for the Nissan 350Z (Z33) and Infiniti G35. Constructed from high-quality stainless steel with a straight-through design, these test pipes eliminate the flow restriction of the factory cats for maximum horsepower and torque gains from your VQ35. Designed for off-road use only.

Key Features:

• High-quality stainless steel construction — corrosion-resistant and built for long-term durability
• Straight-through design — eliminates catalytic converter restriction for maximum exhaust flow
• Stock flange locations — compatible with OEM and aftermarket components using stock-style flanges and mounting locations
• O2 sensor adapter extensions included — maintains O2 sensor positioning for ECU compatibility
• Complete hardware kit — all gaskets and hardware included for a clean installation
• Pairs with ISR Y-pipe and exhaust — designed to work seamlessly with ISR’s full exhaust lineup for maximum VQ35 performance

Performance Benefits:

• Maximum Flow: Straight-through design removes the single largest exhaust restriction on the VQ35 platform — the factory catalytic converters
• Horsepower & Torque Gains: Reduced backpressure translates directly to measurable power gains, especially when paired with a tune, intake, and ISR exhaust system
• Improved Exhaust Note: Eliminating the cats opens up the VQ35’s exhaust tone significantly — a deeper, more aggressive sound throughout the RPM range
• Stock Flange Compatibility: Works with OEM components or any aftermarket exhaust using stock-style flanges — no adapters or fabrication required
• O2 Sensor Retention: Angled O2 sensor adapter extensions maintain sensor positioning to prevent CEL issues

Specifications:

• Brand: ISR Performance
• Part Number: IS-TP-Z33
• Material: Stainless steel
• Design: Straight-through (cat delete)
• Flange Compatibility: Stock-style flanges (OEM and aftermarket)
• O2 Sensors: Adapter extensions included
• Use: Off-road use only

Fitment Information:

• Nissan 350Z (Z33) — VQ35DE / VQ35HR
• Infiniti G35 — Coupe and Sedan, VQ35DE / VQ35HR
• Note: Verify your specific year and engine variant before ordering
• Aftermarket Exhaust: Compatible with aftermarket exhausts using stock-style flanges and mounting locations

What’s Included:

• 2x Stainless steel test pipes
• 2x 2-bolt exhaust gaskets
• 2x 3-bolt exhaust gaskets
• 2x O2 sensor adapter extension (angled)

Installation Notes:

• Allow exhaust system to cool completely before beginning installation
• Apply anti-seize to all exhaust fasteners before installation
• Use new gaskets (included) for a leak-free seal
• Install O2 sensor adapter extensions to maintain sensor positioning
• An ECU tune is recommended after installation to take full advantage of the increased exhaust flow
• A CEL for catalyst efficiency may appear — an O2 sensor simulator or tune can address this

VQ35 Exhaust System:

The VQ35DE and VQ35HR in the Nissan 350Z and Infiniti G35 are naturally aspirated engines that respond well to exhaust modifications — particularly cat deletion, which removes the most significant flow restriction in the factory exhaust system. The factory catalytic converters are designed to meet emissions standards, not maximize flow, and their removal is one of the highest-impact exhaust modifications available for the VQ35 platform. Paired with ISR’s Y-pipe and cat-back exhaust, these test pipes complete a full exhaust system upgrade that transforms the VQ35’s power delivery and exhaust note.

Why ISR Performance?

ISR Performance has built a strong reputation in the Nissan and Infiniti enthusiast community for producing high-quality, well-fitting exhaust components at competitive prices. Their products are engineered specifically for the platforms they support — not universal fitments adapted to work — which means clean installations, proper fitment, and reliable performance. The IS-TP-Z33 test pipes are a staple of the Z33/V35 exhaust build community for good reason.

Perfect For:

• Nissan 350Z and Infiniti G35 owners building a full exhaust system for track or off-road use
• VQ35 builds seeking maximum exhaust flow and power gains
• Enthusiasts pairing with ISR’s Y-pipe and cat-back for a complete ISR exhaust system
• Off-road and track builds where emissions compliance is not required
• Anyone replacing worn or damaged factory catalytic converters on a dedicated off-road build

Pro Tip: Pair with ISR’s Y-pipe and cat-back exhaust for the full ISR exhaust system — the combination delivers the best flow, fitment, and exhaust note of any bolt-on exhaust setup for the Z33/V35 platform.

⚠️ Off-Road Use Only: These test pipes delete the catalytic converter and are designed for off-road use only. They are not legal for use on public roads in emissions-regulated jurisdictions. All ISR Performance exhaust products are designed for off-road use only.