Hands down Sandy Muffler and Brake. Just don't let them do anything but exhaust. You'll get your car abck worse then it went in. But then again I'm not local.
I don't like Sandy Muffler and Brake, but only had one experience there. Master Muffler on 700 East and about 9200 South has some really good welders there. I've had work done there a few times.