Bigbro6785- If you get too big of an exhaust you will end up looding power. Also the RSX has a 2.0L engine where as ours is a 1.8 so it flows more air. Please explain race headers more, are you talking about headers that are used for race only and dont have to be attached to a cat? Or race headers as in like headers with 2.5" collectors and used for big exhaust systems that put out big power.
Honestly you will not be needing a big header like JUN or Spoon, even SMSP or Hytec cause they have 2.5" collectors. Unless you plan on building a 2.0L engine or one that can rev to 8500rpm just stick with something like DC, Gready, Comptech.
Sorry if I have made any one mad or anything by putting you down for bad choices or what not. But It is kinda hard to suggest a header with out knowing what you want out of it. Do you want top end power, or more mid range that you would be able to feel on the streets? Answer these questions and then we can give you an educated guess on what type of header is good for you. I bet you didnt know that there was so much thought that goes into purchaseing a header? :wink: