ISR HGC Long Tube Headers for Nissan 350Z, 370Z, Infiniti G35 & G37

Upgrade your VQ-powered Nissan or Infiniti with the ISR Performance HGC Long Tube Headers, designed for drivers who want stronger exhaust flow, a sharper exhaust tone, and improved performance over the restrictive factory manifold and catalytic converter setup.

These ISR long tube headers are a popular performance upgrade for the Nissan 350Z, Nissan 370Z, Infiniti G35, and Infiniti G37. Built from 304 brushed stainless steel with heavy-duty flanges, they are engineered to improve exhaust efficiency while maintaining the strength needed for aggressive street, track, drift, and competition builds.

Why Upgrade to ISR HGC Long Tube Headers?

The factory exhaust manifold and catalytic converter setup can restrict exhaust flow, especially on modified VQ engines. ISR’s long tube header design helps the engine breathe more efficiently by improving exhaust scavenging and reducing restriction. The result is better throttle response, a more aggressive VQ exhaust note, and stronger power potential when paired with supporting exhaust upgrades and proper tuning.

Key Features

• Long tube header design: Improves exhaust flow and supports stronger mid-range and top-end performance.
• HGC high ground clearance layout: Collector placement is designed to maximize ground clearance without sacrificing performance.
• Stepped primary tubing: Helps retain low and mid-range torque while allowing better high-rpm horsepower gains.
• 304 brushed stainless steel construction: Built for durability, heat resistance, and long-term performance.
• Heavy-duty flanges: Provides a strong sealing surface for reliable installation.
• Factory O2 sensor support: Each header includes two O2 bungs downstream of the collector for upstream and downstream O2 sensors.
• AWD compatible: Works with G35X and G37X AWD applications.
• Complete installation hardware: Includes headers, gaskets, O2 bung plugs, exhaust nuts, and bolts.

Vehicle Fitment

• Nissan 350Z Z33: VQ35DE / VQ35HR applications
• Infiniti G35: VQ35DE / VQ35HR applications
• Nissan 370Z Z34: VQ37VHR applications
• Infiniti G37: VQ37VHR applications
• Infiniti G35X / G37X: AWD applications compatible

What’s Included

• 2x ISR stainless steel long tube headers
• 2x 2-bolt exhaust gaskets
• 2x head-to-manifold gaskets
• 4x O2 sensor bung plugs
• 4x exhaust nuts
• 4x exhaust bolts

Installation Notes

• Primary O2 sensor harness extension is required because the O2 sensor location is lower on the header.
• Professional installation is strongly recommended due to the tight engine bay and header location.
• For best results, pair with a high-flow Y-pipe, cat-back exhaust, and proper ECU tuning.

Video: ISR Long Tube Headers Sound Example

Hear how ISR long tube headers can change the sound and character of a VQ-powered Nissan 350Z. Sound will vary depending on the full exhaust setup, engine, tune, and supporting modifications.

Important Legal Notice

Competition use only. These headers are legal only for use in competition vehicles that may never be registered, licensed, or used on public streets or highways, and for other exempted vehicles. Please check all local, state, and federal laws before purchase or installation.

If you want a serious VQ exhaust upgrade with stronger flow, aggressive sound, and high ground clearance design, the ISR Performance HGC Long Tube Headers are one of the most popular choices for 350Z, 370Z, G35, and G37 performance builds.