The PERRIN Performance catback exhaust for your STI and WRX sedan is one of the best and first modifications you should do to your Subaru, gain horsepower and unleash that aggressive Subaru sound. Made from 3"" 304ss tubing for maximum exhaust flow and extreme durability. The PERRIN Performance catback exhaust features a direct bolt on installation to the OEM down pipe and aftermarket down pipes with no "neck down" because of a special flange that is designed to bolt to both the smaller OEM flange and the larger aftermarket flanges. This is followed by an intermediate V-band connection that allows fine tuning of the exhaust alignment and provides an air tight seal and finally a "Y" section splits the exhaust and directs it to the left and right mufflers.
Finishing off the PERRIN catback are two mufflers and four 3.5" slash cut tips, two on each side.