Perrin Lightweight Crank Pulley Black WRX (2002-2014) STI (2004-2018) Mazda the included silencer helps to

the included silencer helps to significantly reduce noise

The design keeps excellent clearance to any moving parts including larger aftermarket sway bars and sway bar braces

they also include precise control dump valves

The PERRIN Performance boost controller cover for the Subaru STI is constructed of 5052 plate aluminum with precision bends and mounting holes to fit perfect under your hood

Bolting up a Q300 to your EJ25 will allow your WRX's sonorous exhaust note to come through loud and clear when you want it to

Perrin Lightweight Crank Pulley Black WRX (2002-2014) STI (2004-2018) Mazda the included silencer helps toPerrin's lightened crank pulley for the Subaru WRX STI LGT is engineered to reduce rotating mass, increasing horsepower and torque. Made from 6061T6 aluminum and weighing 1. 2lbs, Perrin crank pulley is more then 4lbs lighter then the stock crank pulley. Perrin's pulley is not underdriven and will not affect the life of your engine. The pulley is simply a redesigned, lighter version of the stock crank pulley. Aftermarket underdrive pulleys are prone