Product Description
Fitment Information:
2002-2007 Subaru WRX
2004-2007 Subaru STI
2004-2008 Subaru Forester XT
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.
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
Difficult Installation Effort
Installation Guide
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.
Usually ships same or next day. 
