GrimmSpeed Air Oil Separator Red WRX (2002-2007) STI (2004-2018) Mazda Thanks to their unique

Thanks to their unique

four-layer cotton-gauze filter that features a redesigned air horn for improved performance

Tech springs for the Subaru WRX utilize the latest spring and material technology to optimize comfort

and hardware will be included to complete installation

The exhaust will give you up to 12WHP gain (see dyno sheets)

GrimmSpeed Air Oil Separator Red WRX (2002-2007) STI (2004-2018) Mazda Thanks to their uniqueGrimmSpeed 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