The air and oil separator is a must have unit for all Subaru engines! Constructed from high-quality aluminum, this handy unit will help you lower emission, keep the intake charge pipe clean, reduce the oil burned in the engine and reduce the detonation due to a dirty intake charge pipe. Tomioka Racing AOS is compatible with factory PCV system and it drains oil into the factory oil pan automatically.

Applications;
SubaruImpreza WRX / STi1993-2011
SubaruForester1998-2011
SubaruLegacy1990-2011