Tomioka Lightweight Crank Pulley Subaru EJ20/EJ25 WRX / STI / Legacy / Forester Vehicle Model_ Lancer Evolution 9 An Air Oil Separator has

An Air Oil Separator has one job: remove the oil from the engine ventilation system so that the oil doesn't get sent through the intake system

Spring Rates: (F) 6kg/mm (R) 4

but they are more durable

this system delivers consistent power

Part #: TTB156F

Tomioka Lightweight Crank Pulley Subaru EJ20/EJ25 WRX / STI / Legacy / Forester Vehicle Model_ Lancer Evolution 9 An Air Oil Separator hasPart #: TR TM2040 Enjoy the freedom of quick engine response with the lightened Subaru Crank Pulley from Tomioka Racing. The pulley reduces approximately 4 lbs of weight off the OEM crank pulley and enabling to rev more freely without the weight bogging it down. CNC machined from 6061 T6 Billet Aluminum and designed to work seamlessly with stock or aftermarket belts, the pulley is guaranteed to reduce rotational mass that haunts the factory OEM