COBB Air/Oil Separator (811615) - 2002-2007 WRX / STI & Forester XT
Developed in partnership with IAG Performance, the COBB Air/Oil Separator (AOS) for your Subaru EJ engine efficiently intercepts oil vapors from the crankcase ventilation system before they can enter your intake tract. Featuring a dedicated individual connection for each of the three engine vent ports (one on each cylinder head and one on top of the block), this design ensures faster crankcase pressure evacuation and reduced system pressure. Built with a compact cast aluminum body, durable black powder coat finish, integrated ORB ports, and a generous 1-liter holding capacity, it provides reliable performance for high-horsepower builds. The kit also includes heat shielding on the crankcase breather and oil return lines, a convenient coolant bleeder valve, and custom COBB styling accents.
Emissions Note: 50 State Legal. 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) numbers: D-660-25 and D-660-45.
Features
- 1-liter holding capacity to safely support high-horsepower builds
- Developed in partnership with IAG Performance with bespoke COBB color combinations and laser-etched logo
- Dedicated individual inlets for each cylinder head and block vent port for superior crankcase pressure evacuation
- Durable cast aluminum body with a sleek black powder coat finish
- Integrated ORB ports and a built-in coolant bleeder valve
- Includes heat shielding on the crankcase breather and oil return lines
Fitment
- 2002 Subaru Impreza WRX Sedan AT USDM
- 2002 Subaru Impreza WRX Sedan MT USDM
- 2002 Subaru Impreza WRX Wagon AT USDM
- 2002 Subaru Impreza WRX Wagon MT USDM
- 2003 Subaru Impreza WRX Sedan AT USDM
- 2003 Subaru Impreza WRX Sedan MT USDM
- 2003 Subaru Impreza WRX Wagon AT USDM
- 2003 Subaru Impreza WRX Wagon MT USDM
- 2004 Subaru Impreza STi MT USDM
- 2004 Subaru Impreza WRX Sedan AT USDM
- 2004 Subaru Impreza WRX Sedan MT USDM
- 2004 Subaru Impreza WRX Wagon AT USDM
- 2004 Subaru Impreza WRX Wagon MT USDM
- 2005 Subaru Impreza STi MT USDM
- 2005 Subaru Impreza WRX Sedan AT USDM
- 2005 Subaru Impreza WRX Sedan MT USDM
- 2005 Subaru Impreza WRX Wagon AT USDM
- 2005 Subaru Impreza WRX Wagon MT USDM
- 2006 Subaru Impreza STi MT USDM
- 2006 Subaru Impreza WRX Sedan AT USDM
- 2006 Subaru Impreza WRX Sedan MT USDM
- 2006 Subaru Impreza WRX Wagon AT USDM
- 2006 Subaru Impreza WRX Wagon MT USDM
- 2007 Subaru Impreza STi MT USDM
- 2007 Subaru Impreza WRX Sedan AT USDM
- 2007 Subaru Impreza WRX Sedan MT USDM
- 2007 Subaru Impreza WRX Wagon AT USDM
- 2007 Subaru Impreza WRX Wagon MT USDM
- 2004 Subaru Forester XT AT USDM
- 2004 Subaru Forester XT MT USDM
- 2005 Subaru Forester XT AT USDM
- 2005 Subaru Forester XT MT USDM
- 2006 Subaru Forester XT AT USDM
- 2006 Subaru Forester XT MT USDM
- 2007 Subaru Forester XT AT USDM
- 2007 Subaru Forester XT MT USDM
- 2008 Subaru Forester XT AT USDM
- 2008 Subaru Forester XT MT USDM
CA Residents: WARNING: Cancer and Reproductive Harm www.P65Warnings.ca.gov
