VQ35DE Test Pipes

This Flashark downpipe exhaust kit, also known as test pipes, is engineered for the VQ35DE engine found in 2003-2006 Nissan 350Z (Z33 chassis) and 2003-2007 Infiniti G35 (V35 chassis) models. It directly replaces the factory catalytic converter sections, which are often a restriction point for performance builds. The primary goal is to enable a freer-flowing exhaust system, resulting in a more aggressive exhaust note and improved throttle response, particularly in the mid to upper RPM range. The construction features 16-gauge T-304 stainless steel for durability and corrosion resistance, with mandrel-bent tubing for consistent exhaust flow and TIG-welded joints for strength. The pipes have 2.5-inch inlet and outlet diameters and utilize 2-bolt and 3-bolt mounting flanges. This kit supports an estimated performance gain of 10-15 HP and 5-10 ft-lbs of torque, though actual results can vary based on the complete exhaust setup, tuning, and installation quality. While a tune is not strictly required for installation, it is recommended for optimal drivability, fuel trims, and performance. A tune may also help mitigate potential check engine light (CEL) illumination, which is a possibility due to the removal of factory catalytic converters. This setup is intended for off-road, track, or performance applications where legal, and may not be suitable for street use or emissions-controlled vehicles. Compatibility with 2007+ 350Z HR models, G35 Sedan models beyond 2006, and heavily modified exhaust layouts should be verified before purchase, as HR engines may use different exhaust configurations.