UI dnno anythign abo that but i got and OBX universal greddy style exhaust and it sounds great with my custom catback. I've been hearing alot of folks talking about their exhaust manifold and i was sure going to buy me some headers from them. But since i heard abo this i'm not going to buy it no more. but the universal exhaust sound good. I just the canister it's so big but i still believe it's slowing my car down.