My mods should be in my sig so u know what im working with, but i plan on getting a new test pipe and header. Right now i have a small 4-1 dc header with a test pipe, (dc exhaust). I want to get 2.5" header but not sure on whats out there. The JDM headers start out at 2.25" then go to a 2.5" collector, right? or is the whole thing 2.5"? Im looking at a Vibrant 2.5" 4-2-1 header or $430. Ohh i forgot to tell u im staying NA. Basicly i want the best NA header on the amrket and for my set up, thanks. Please help