Great news – on this purchase, you'll enjoy a BuildBUX bonus of $0.15.
Product Fitment:
2008-2014 WRX
2005-2009 Legacy GT
If you picked up a second hand GrimmSpeed Air Oil Separator, it is likely that you are missing most of the hardware pieces to go along with it. We are happy to offer replacement hardware kits to get your Subaru back on the road and keep blow-by under control!
If you are replacing the hardware, we also recommend picking up one of our AOS Rebuild kits to replace the O-Rings in the AOS body that can wear out over years of heat cycles.
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Get more cashback! Items are changing weekly. Anywhere from 1% to 20% Back in BuildBUX when you make purchases. Products
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Every month when you are charged your $4.98 subscription fee, you will get $15 in BuildBUX
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