I'm sorry, and I feel really stupid to ask this but, by "header" what do you mean? And by "intake/header/exhaust" do you mean a cold air intake and a new intake manifold (the same deal with the exhaust)? Speaking of exhaust, should I get a cat-back or get a new exhaust manifold and then new everything else that follows?
I am just trying to learn cause working on cars is fun to me and making them fast is funner.