Grimmspeed Air Oil Separator (Blue) - Subaru STI VA 0w40 Street use and light track

Street use and light track use

This makes for not only the coldest air possible but the most air possible

Fits 2008-2018 Subaru WRX and 2008-2017 STI

Grooves in the bushing ensure grease stays where it needs to be and prevents creaking after extended use

This PERRIN sway bar increase stiffness by a minimum of 50% overstock

Grimmspeed Air Oil Separator (Blue) - Subaru STI VA 0w40 Street use and light trackFits 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