GrimmSpeed Air Oil Separator Blue WRX (2002-2007) STI (2004-2018) Mazda The PERRIN Performance boost controller

The PERRIN Performance boost controller cover for the Subaru STI is constructed of 5052 plate aluminum with precision bends and mounting holes to fit perfect under your hood

The tow hook adapter is CNC machined hex cut bar stock and anodized black for better corrosion resistance

This allows uninterrupted exhaust flow from the 3

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

If no mention of your crank pulley is made customers will receive Gates belt K060535 (1379mm) by default

GrimmSpeed Air Oil Separator Blue WRX (2002-2007) STI (2004-2018) Mazda The PERRIN Performance boost controllerGrimmSpeed 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