I was wondering if i could install a performance DC header on my civic, the problem is that the header is for the EX model, so that means that I'll have to remove my stock header, plus the catalitic converter, but after all that will the header bolt-on my civic.

 

Well, yes, and no. It will fit, but I dont think you will have room for a cat, with your DX piping. Get ready for a dirty bumper and a loud(er) exhaust.