ISR Performance Long Tube Headers | G35, G37, Q50 | 350Z, 370Z | T304 Stainless | 3" Merge Collectors | Max Power & Sound | Direct Fit for VQ35DE/HR & VQ37VHR

Unlock the full potential of your 2003-2008 Infiniti G35, 2008-2013 G37, 2014-2015 Q50 3.7L, 2003-2008 Nissan 350Z, or 2009-2020 370Z with ISR Performance Long Tube Headers designed to replace the restrictive factory exhaust manifolds and catalytic converters that choke the VQ35DE, VQ35HR, and VQ37VHR engines, because the ISR headers use equal-length 1.75" mandrel-bent T304 stainless steel primaries that feed into high-velocity 3" merge collectors with scavenging spikes to maximize exhaust flow, eliminate backpressure, and increase cylinder evacuation for huge gains of 20-30whp and 18-25wtq with a tune while adding violent throttle response and mid-range torque that pulls from 4000 RPM to redline, and the sound transforms from quiet stock to a raw, aggressive, race-car scream with deep idle, angry cold start, and high-RPM howl that makes your VQ sound like a tuned JDM monster without the tinny rasp you get from test pipes alone, and the entire header is fabricated from heavy-gauge T304 stainless with full-penetration TIG welds, 3/8" thick CNC-machined head flanges that won’t warp, and 3" v-band outlets for leak-free connections to any 3" exhaust, and the one-piece long tube design deletes both primary catalytic converters for maximum flow while tucking tight to the chassis for perfect ground clearance on lowered cars, and fitment is direct bolt-on for RWD VQ35DE/HR/VQ37VHR using all OEM mounting points with zero cutting or welding, clearing the steering shaft, motor mounts, transmission, and subframe on manual and automatic cars with no rattling or interference, and the kit includes O2 sensor bungs for both primary and secondary sensors plus defouler bungs to help prevent CELs on most setups, multi-layer steel exhaust gaskets, and Grade 10.9 hardware for a solid install that holds up to daily driving, canyon runs, and track abuse, and they pair perfectly with ISR y-pipes, test pipes, and cat-backs to build the ultimate full 3" VQ exhaust that makes the most NA power possible, so if your G35, G37, Q50, 350Z, or 370Z feels slow, sounds quiet, and you want the single biggest horsepower mod for your VQ, ISR Performance Long Tube Headers are the proven upgrade to kill restriction and unleash power and sound, and every set is jig-welded, pressure-tested, and QC inspected for flange flatness, primary alignment, and weld penetration so you get ISR’s legendary flow, fitment, and tone without the cracking, leaks, or fitment nightmares you get from cheap eBay headers.