GrimmSpeed Air Oil Separator Blue WRX (2002-2007) STI (2004-2018) Mazda and spare "C" clip

and spare "C" clip

This axle-back exhaust from TurboXS for the 2004-2008 Forester XT features 304 stainless steel construction with 3

The PERRIN inlet hose is perfectly smooth on the inside and has a significantly larger internal diameter than the OEM part

Corsa's non-restrictive

GrimmSpeed offers an enlarged variation of the standard size OEM gasket

GrimmSpeed Air Oil Separator Blue WRX (2002-2007) STI (2004-2018) Mazda and spare "C" clipGrimmSpeed has a unique design for the Subaru WRX, STI and Legacy GT which allows you to keep your PCV valve while separating the oil out of the crankcase and head ventilation air. None of the other competitors on the market are able to vent both. The unit is very compact and efficient, it bolts directly on to the factory oil cap location. You will no longer have to keep tabs on your oil level and or empty the catch can like on most standard cans as