well i got a jasma mugen power 4-1 header for 94-up gs-r, ITR, b17 or b16a, or even b18a...this header really gives u the power u want ...but in this case my car is in the process of getting sold so i got this header at home doing nothing..so it needs to go it has the 2 1/4 collector or 2.5 one of those and its polished and shiny perfect condition only one small scratch in the bottom...from where the header was sitting down a while ...775$ takes it...