Perrin Lightweight Crank Pulley Red WRX (2002-2014) STI (2004-2018) Legacy GT Suspension (10-up) The unique vanes inside the

The unique vanes inside the disc maximize airflow through the AeroRotor to reduce turbulence and flow more air than any rotor tested

and harshness

The 1/2 inch thick flanges offer a secure fit along with the factory placement exhaust hangers

giving you the loudest most aggressive exhaust system available for the Mazdaspeed3

Perrin Lightweight Crank Pulley Red WRX (2002-2014) STI (2004-2018) Legacy GT Suspension (10-up) The unique vanes inside thePerrin'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