AMS Performance Alpha Cast Downpipe for Nissan GT-R 2009-2021

Description: The Alpha Nissan GT-R 90mm Cast Wide mouth Downpipes are the best performing and most durable on the market. During testing our shop GT-R with Alpha upgraded turbos saw gains across the power band of 100 wheel horsepower and over 130 ft lbs of torque with this simple bolt-on!  Turbo spool-up was also improved by almost 400rpm. Our downpipes perform better and are not prone to cracking like the alternatives offered by the competition.  By casting these downpipes in robust 304 Stainless Steel we were not limited by the design restraints of hand fabricated construction.  The AMS engineering team utilized Solidworks to blueprint the inlet and outlets with smoother features and geometry to optimize exhaust flow. They also provided thick flanges to prevent exhaust leaks and utilize the factory mounting hardware for OEM like fitment. Most other systems implement 76mm (3”) downpipes that can cause unnecessary back pressure. By using a larger 90mm (3.5”) primary pipe we were able t