I had a shop do mine. But mine was cobbled up right out of the manifold, so he fixed all that. Plus ran a split right after the rear axle for 'dual' exhaust with the pencil tips. I just have straight pipes. People can't believe it, as its not very loud at all. I may go back with a muffler someday. Anyway this shop was like 180 bucks or so. Another guy quoted me 600. So it pays to shop around