Benefits:
- Keep your Subaru running strong and your intake system free from blow by
Features:
- Bespoke COBB Anodizing on Caps
- Compact Cast Aluminum Tank Design
- Wrinkle Black Powder Coated Canister
- Developed in Partnership with IAG Performance
- Laser Etched COBB Logo
Applications:
- 2009-2013 Subaru Forester XT AT USDM
- 2005-2009 Subaru Outback XT AT USDM
- 2015-2021 Subaru WRX STI Sedan MT USDM
- 2008-2014 Subaru Impreza STi Hatch MT USDM
- 2008-2014 Subaru Impreza WRX Sedan MT USDM
- 2008-2008 Subaru Impreza WRX Sedan AT USDM
- 2005-2009 Subaru Legacy GT MT USDM
- 2008-2014 Subaru Impreza WRX Hatch MT USDM
- 2006-2009 Subaru Legacy GT Spec B MT USDM
- 2005-2009 Subaru Outback XT MT USDM
- 2008-2008 Subaru Impreza WRX Hatch AT USDM
- 2005-2009 Subaru Legacy GT AT USDM
- 2011-2014 Subaru Impreza STi Sedan MT USDM
- 2018-2018 Subaru WRX STI Type RA Sedan MT USDM
- 2009-2010 Subaru Impreza 2.5 GT Hatch AT USDM
- 2009-2010 Subaru Impreza 2.5 GT Sedan AT USDM
- 2019-2019 Subaru WRX STI S209 Sedan MT USDM
Application Notes:
- Emissions: 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) number: D-660-25
Description:
The COBB Air/Oil Separator is placed within your Subarus crankcase ventilation system and helps to prevent oil vapors from being introduced into the intake system. The COBB Air Oil Separator has been developed in partnership with IAG Performance and offers exclusive features.
1 Liter Holding Capacity
Integrated ORB Ports
Compact Cast Aluminum Body w/ Black Powdercoat Finish
Heat Shielding on Crankcase Breather and Oil Return Lines
Coolant Bleeder Valve
Bespoke COBB Color Combination
Laser Etched COBB Logo
The Subaru EJ engine has 3 ports that vent crank pressure: one on each cylinder head and another on the top of the block. Each engine vent port receives its own connection to the AOS. By giving each engine port its own entrance to the AOS we have allowed for more effective and faster excavation of crankcase pressure. Additionally, this reduces overall system pressure. With a 4" OD and 5.75" height, the AOS has an approximate 1 liter of holding capacity. The larger the AOS, the more power you can safely make without having to worry about the AOS overfilling.
The bottom of the AOS is shaped like a snail, redirecting positive crank pressure into the same swirl pattern produced by the 3 side ports. Allowing maximum oil drainage while separating oil from the air in all the venting ports.
The back plate of the AOS features a unique coolant routing system that heats the entire AOS to the same temperature of the engine. This maximizes the evaporation of any water collecting inside of the can. The hotter the AOS, the less water will collect inside and mix with the oil.
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.
