Cobb Air Oil Separator Subaru WRX 2008-2014 / STI 2008-2021 / Legacy GT 2005-2009 | 822615

Fitment Information: 2008-2014 Subaru WRX 2008-2021 Subaru STI 2005-2009 Subaru Legacy GT 2005-2009 Subaru Outback XT 2009-2013 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