GrimmSpeed Air Oil Separator Blue WRX (2002-2007) STI (2004-2018) Mazda which relocates the air filter

which relocates the air filter outside of the engine bay for a cooler

This kit includes a performance pressure plate

The the N1 muffler has a JDM look

GrimmSpeed offers an enlarged variation of the standard size OEM gasket

This means that you can adjust the volume of air released when blowing off

GrimmSpeed Air Oil Separator Blue WRX (2002-2007) STI (2004-2018) Mazda which relocates the air filterGrimmSpeed 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