ISR Performance HGC Long Tube Headers - Nissan 370Z VQ37HR / G37

ISR Performance HGC long tube headers for the Nissan 370Z and Infiniti G37 with the VQ37 replace the factory manifolds and catalytic converters with 304 brushed stainless steel long tubes on heavy duty flanges. A stepped primary design holds on to low and mid range torque while opening up top end horsepower, and the HGC collector placement keeps ground clearance where a long tube header usually gives it away.

Design

• 304 brushed stainless steel with heavy duty flanges
• Stepped primaries for torque retention and top end gains
• HGC high ground clearance collector position
• Two O2 bungs per header, downstream of the collector, so both factory upstream and downstream sensors can be used
• Downstream bung includes a flow restrictor to help avoid check engine lights

Fitment

Nissan 370Z and Infiniti G37 with the VQ37VHR. These headers are identical to the VQ35 350Z model and can be interchanged.

Expected results

With an UpRev tune, intake, these headers and a full exhaust, ISR quotes a gain of around 40whp and 23wtq. Complete the system with the ISR Performance exhaust Y-pipe for the 370Z/G37 and the ISR GT Single exit exhaust for the 370Z.

Install note

The primary O2 sensor location sits lower on the header than stock, so the primary O2 harness must be extended to reach.

What is in the box

• 2x ISR 370Z 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

All ISR Performance products are designed for off-road use only.

Legal in California only for racing vehicles which may never be used, or registered or licensed for use, upon a highway.