Infiniti G37, 370Z & Q50 High-Flow Downpipes/Test Pipes - 2.5" T304 Stainless Cat Delete | VQ37VHR Performance Exhaust | Aggressive Sound + Power | Direct Bolt-On

Maximize your VQ37VHR’s performance and sound with these High-Flow Downpipes/Test Pipes built for 2008-2013 Infiniti G37 Coupe/Sedan, 2009-2020 Nissan 370Z, and 2014-2015 Infiniti Q50 3.7L by replacing the restrictive, honeycomb-filled factory primary cats with smooth 2.5" mandrel-bent T304 stainless steel piping that eliminates the biggest choke point in the VQ exhaust system, drastically reducing backpressure and increasing exhaust velocity so your V6 can exhale freely and make real power, delivering a proven 12-18whp and 10-15wtq gain on stock cars and 22+whp with a tune, intake, and cat-back while transforming the tame factory exhaust into a raw, aggressive, high-RPM VQ howl with razor-sharp throttle response, louder cold starts, and race-inspired rasp that makes every downshift and 7500 RPM pull sound exotic, and they’re constructed from thick 14-gauge T304 stainless with hand TIG-welded seams, CNC-machined 10mm 2-bolt flanges that are surface-milled for perfect flatness and port-matched to the VQ37VHR exhaust ports to prevent leaks and gasket failure, and finished in brushed satin or high-polish to resist corrosion, heat bluing, and cracking through years of heat cycles, and you get your choice of non-resonated for maximum volume, crackles, and track-day aggression or resonated with integrated Helmholtz chambers or spiral-flow resonators that target and cancel 1800-2500 RPM drone for daily drivers without killing horsepower, and both versions include O2 sensor bungs in the exact OEM location plus optional 90-degree or J-style defoulers to help minimize P0420/P0430 CEL codes on stock ECUs, though a tune is still recommended for optimal AFRs and to fully disable codes on 2009+ models, and fitment is 100% direct bolt-on using all factory mounting points so they mate to stock exhaust manifolds and y-pipe or any aftermarket headers and cat-back with zero cutting, welding, or hammering required, and they clear factory heat shields, steering shafts, subframes, and sway bars on RWD, AWD, manual, and automatic cars with no rattling or interference, and the kit ships complete with multi-layer steel exhaust gaskets, Grade 10.9 zinc-plated hardware, and anti-seize for a leak-free install that takes 1-2 hours on a lift, and they pair perfectly with y-pipes, single exits, and intakes to build a full bolt-on VQ exhaust that finally sounds as fast as it is, so if your G37, 370Z, or Q50 3.7L feels choked up, sounds stock, and leaves power on the table, these High-Flow Downpipes/Test Pipes are the single best dollar-per-horsepower mod for unlocking aggressive VQ sound, real mid-range torque, and top-end pull that makes the VQ37VHR come alive, and every set is pressure-tested, fixture-checked for alignment, and inspected for weld quality so you get perfect fitment and zero exhaust leaks without the warped flanges and cracked welds you get from cheap brands.