Perrin Dual Tube Catback WRX / STI Sedan (2011-2018) Infiniti The ALTA Shift Knob has

The ALTA Shift Knob has a 1

Lifetime Warranty on downpipe

torque gains and a rich deep sporty sound

allowing your engine to produce more horsepower and torque

Invidia Bellmouth Downpipe

Perrin Dual Tube Catback WRX / STI Sedan (2011-2018) Infiniti The ALTA Shift Knob hasThe 2015 WRX exhaust is extremely quiet in stock form, so Perrin set out to create a louder exhaust. They filled this gap with their non resonated catback exhaust. It is mellow, yet aggressive on the 2015 2018 WRX, but much louder on the 2011 2014 WRX and 2011 2018 STI. Perrin uses quality 304 stainless steel materials that can withstand temperatures of up to 1800 F and will come in a nice brushed finish that promotes a cleaner look. They also