I should have added that I bought long branch exhaust manifolds, so they removed entire exhaust and installed new one from the block back. They are a small local shop and also race modified cars. They dyno all their motors, X-pipe is the best but would not fit on my car. Mine has an H-pipe and I am very happy. All welded and new hangers, real sweet! I don't think I would have enjoyed putting it on myself if I did buy the kit. Pete