personaly, for my street cars, I go out and buy good used stuff off craigslist, cut it up, and reweld it.....I only go to a shop if I need some flanges or something swedged.....I for the most part build my own mufflers as well. The exhaust on my Wagon is made from the good, original headpipes and the old replacement exhaust off of a 90's chev truck (only used for a few months) and the muffler is built out of the back of an old steel cabnet that was backed into.....I think Im into everything $20-25 and an afternoon.