This has been talked about quite a bit, search and you'll get a bunch of suggestions. I can say that my firsthand experience is Master Muffler of Kearns will treat you right. They did a complete custom exhaust on my buggy from the headers tot he exhaust tip and their price was very good and they used nicer tubing than most places I went to were going to use. I priced all the shops around SL valley I could think of and find in the yellow pages.