Internal baffle design + closed loop circuit far superior to anything else on the market, and proven to vastly reduce the amount of oil found in external catch cans. 10AN ORB main vent6AN drain back port ( connects via check valve to catch can, gravity drain)Adjustable base allows 30 degrees of rotationO-ringed base flange like OEM, using OEM thread pitch for filler cap( not included)Clears OEM throttle body, OEM intake manifolds, Bosch DBW, Turblown/Xcessive lower intake manifoldsInternal baffle design + closed loop circuit far superior to anything else on the marketDoes NOT include any adapter fittings or plugs. Comes with O-ring and allen head hardware.