Grimmspeed Air Oil Separator (Black) - Subaru STI VA Coolant Expansion Tank This material stands up to

This material stands up to extreme UV and is manufactured specifically to retain its elastic qualities despite changes in temperatures

- Steel backed organic friction material

30 Step Damping Force Adjustment

Compatible with the factory shift knob or any aftermarket knobs designed to replace the factory unit

Grimmspeed Air Oil Separator (Black) - Subaru STI VA Coolant Expansion Tank This material stands up toFits 2015+ Subaru STI An Air Oil Separator has one job, remove the oil from the engine ventilation system so the oil does not get sent through the intake system. The GrimmSpeed AOS is unique as it allows you to maintain your PCV Valve while separating the oil out of the crankcase and head ventilation air! Our AOS will allow your engine to run more efficiently due to the separation of oil from the intake system. When there is oil in your system, the