GrimmSpeed Air Oil Separator Blue WRX (2002-2007) STI (2004-2018) Mazda 20mm 3-hole adjustable

20mm 3-hole adjustable

Applicable bearings

T-6 aluminum alloy intake is finished off with an Injen performance dry air filter with built-in velocity stack

Sold as a pair

The number of filter layers affect the performance and price of your intake (less layers = lower price

GrimmSpeed Air Oil Separator Blue WRX (2002-2007) STI (2004-2018) Mazda 20mm 3-hole adjustableGrimmSpeed 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