Subaru Air/Oil Separator FXT 2004-2008, WRX 2002-2007, STI 2004-2007
Compact Cast Aluminum Tank Design
Bespoke COBB Anodizing on Caps
Wrinkle Black Powder Coated Canister
Laser Etched COBB Logo
Developed in Partnership with IAG Performance
The COBB Subaru Air/Oil Separator helps to prevent crankcase oil vapors from recirculating back through your engine's intake system.
Oil vapors passing through your engine's intake system lower the effective octane rating of fuel and can contribute to both oil and carbon buildup over time.
Note: This AOS can be installed to 2002-2005 WRXs with modification to or relocation of the Cruise Control Module.
This part is legal for sale and use on Emissions Controlled Vehicles in all 50 states when used in accordance with the manufacturer's application guide because it has a California Air Resources Board (CARB) Executive Order (EO) number: D-660-25 D-660-45