the exhaust will physically bolt up to the head, which was what I thought he was getting at. alot of people assume because the intake manifold is a different pattern that the exhaust manifold is different as well. Also for some reason I though he was talking about an aftermarket header not a stock one. h: and Generally aftermarket headers don't take into account differences in collector length for different years. They just make one header that fits all applications and you get to modify your exhaust to fit it.