The Invidia front pipe will remove the restrictive factory cat and resonator to free up more power for your BRZ. As with all Invidia exhaust components, you can expect high quality TIG welding, full polished piping, and CNC mandrel bends and smooth transitions. The 60mm piping will release the demons from your Boxer engine even quicker making for a more aggressive exhaust note and extra HP! Perrin has seen 5-7 horsepower gains in conjunction with their catback exhaust. Invidia offers a straight pipe version and a premium high quality 200 cell metallic core catalytic converter version. A resonator is optional for the catless pipe to decrease exhaust volume and rasp without hurting flow. A new gasket, 2 bolts, and 2 nuts are included.