Header question..

[fuze]

I have a "02" DC5R and i was thinking to get a header (DC sport K series 4-1) i looked in the engine bay and it 'seams' that the header 'is' 4-1 model (correct me if im wrong, and JDM is 4-2-1) then the down pipe, CAT and finaly the exhaust (CAT back).. Now, if i changed the header would it be a big differnce connectng it to the rest of the factory parts..? couse the down pipe is quite big but then the CAT and exhaust piping is small..?

or should i just get a better CAT back exhaust system..?
reason for the questin is that i was thinking of getting a K100 installed and yea, wanna know the diffeernce before its tuned..

[Dylanamus]

If I was you, I'd do the whole exhaust system while you're at it. You're not getting your money's-worth out of the new header if it's bottle-necked by smaller diamter exhaust piping and stock cat convertor. You could also just get the whole thing done in one go by an exhaust workshop and any joinery issues would be cleared up professionaly for you right then and there.