The TurboXS Catless Front Pipe for the 2015 WRX is one of single best power adding modifications you can do to your Subaru's engine. The Catless Front Pipe is made completely from a 304 stainless steel constrction with durable 12mm thick flanges. The Catless Front Pipe features a 3.5" to 3" taper that allows for an all around better exhaust flow, this will improve performance with massive gains in horsepower and torque. TurboXS states this front pipe will add up to 30 ft/lbs of torque and 25 wheel horsepower! All hardware is included for a hassle free installation.