alright ill just go to the local muffler shop and see how much for everything, also a question about the header, i got a pretty bad dent in my dc jdm 4-1 header, a mechanic that was under my car said i have about a millimeter more before it goes through, is this hurting performance greatly? also i have that header with a 2.5" car sound cat then it goes to the greddy evo cat back 2.25, i bought a shortened b pipe from a greddy to fit the header but the car still makes a annoying buzzing sound when i hit vtec then all the way through, its like bees and also a fartcan, i know the fartcan because of the gradual decrease size through piping. thanks again