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Fitment and Product Information: Air/Oil Separator (Red), For 2002-2007 Subaru WRX, 2004-2020 STI, 2004-2008 Forester XTBrandname: GrimmSpeed Part Number: 078006R Description: The GrimmSpeed™ Air/Oil Separator for Subaru vehicles has a unique design that allows you to maintain your PCV Valve while separating the oil out of the crankcase and head ventilation air! Our AOS will allow your engine to run more efficiently due to the separation of oil from the intake system. When there is oil in your...

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