hmmm OEM, vented, which one? both are light weight, and it dont matter if its vented or not. evos and lancers got vents and nothing happens to them. i work on all imports and vented actually helps. to much heat from the turbos, specially if you want to boost more then 20+ psi, will mess up alot of s**t.electronics dont like heat lol. some of the guys where i go to school at made custom "water paths" where the vent is so it directs water and debri away from any components. if your freaked out that someone said your turbo will crack from water, then just heat wrap ur turbo with ceramics, or just add ur turbo somewhere that wont likey to get water on.