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The IAG Performance Street Series billet aluminum Air / Oil separator (AOS) vents crankcase gasses back to the turbo inlet. The design is based on years of service on racing and high horsepower Subaru's. The AOS's approximate 1-liter capacity, fully heated housing, superior breathing and unique patent pending baffle design sets it apart from the rest. AOS TOP Breather Port Rotation For Install Ease Dual Breather Port Greater Pressure Stream Oil Separation AOS BODY Large Billet Aluminum Design Approximate 1 Liter Holding Capacity Integrated 3 Port Billet Hose Barbs Aluminum Body is Powder Coated In Red, Black, Gold, Dark Silver. Also available in World Rally Blue (automotive paint). AOS BOTTOM Unique Baffling Controls Crankcase Pressure Returns Oil To The Engine No Maintenance or Manual Draining Required