ARC Mitsubishi EVO 8 Oil Catch Tank works just like a crankcase vent filter. It will bypass the connection between the crankcase and the air induction intake track. This will relieve pressure place against the valve train under engine load. But unlike a crankcase vent filter, the oil used by the valve train will not drip onto adjacent engine components. The oil catch can will catch all excess oil that is blow out by the valve train. This will keep your engine compartment clean, your performance maximized, and give your engine that custom look.