Radium Engineering 2015+ Subaru STi Air Oil Separator-Return Kit 2015+ WRX Cooling NOTE: If operated in freezing

NOTE: If operated in freezing environments

2 oz (142 g/m2)

that don't want to be flashy

When arriving to the racetrack

Their designs result in an excellent free-flow exhaust system with optimized back pressure

Radium Engineering 2015+ Subaru STi Air Oil Separator-Return Kit 2015+ WRX Cooling NOTE: If operated in freezingHigh powered modified Subaru engines tend to generate excessive blow by oil and gasses. In these cases, an ordinary small catch can may quickly fill with oil and not be adequate. Like the Radium Engineering Subaru Dual Catch Can Kit, the AOS (Air Oil Separator) kit is responsible for keeping blow by oil and other pollutants out of the intake pipe, manifold, turbocharger, and intercooler during all engine loads. The main difference is that an AOS "R"