Subaru WRX 2002-2007 STi 2004-2019 AOS Air Oil Separator
Air oil separator removes oil from your engine ventilation system so the oil does not get into the intake system.
Vehicle Fitment:
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Subaru WRX 2002-2007
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Subaru STi 2004-2019
Key Features:
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Retains OEM PCV valve
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Engine performs cleaner and more efficiently
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Precision CNC machined
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6061 billet aluminum
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High quality continental hose
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Includes fittings, caps, and zip ties