Air Oil Separator (AOS-R) Kit for Subaru 09-13 XT / 08-14 WRX / 15-21 S Ti Radium Engineering - USA-RAD-20-0607 - 20-0607 09-13 Subaru Forester XT08-14 Subaru Impreza WRX08-14 Subaru Impreza WRX S Ti 15-21 Subaru WRX S Ti Dimensions AOS Height: 6.3" (without fittings)AOS Diameter: 3.45" Round AOS Capacity: 20.3 oz (600m L) Ports Inlet: 7/8"-14 threaded for 10AN ORB fittings Outlet: 7/8"-14 threaded for 10AN ORB fittings Return: 7/8"-14 threaded for 10AN ORB fittings Coolant: 7/16"-20 threaded for 4AN ORB fittings (x 2) Benefits-Effectively raises the octane and increases engine performance with cleaner inlet air -Prevents oil buildup in the intake or intercooler system walls, throttle body, intake manifold, etc.-Lowers hydrocarbon emissions Included-Machined alumium Radium Engineering Air Oil Separator-Subaru specifically designed mounting bracket-All necessary SAE J30R7 rated PCV/Emissions hose-Coolant hoses and fittings-All necessary aluminum fittings and hose-ends-Stainless steel mounting hardware  Instruction PDF