X2...
Look in the yellow pages, find a "mom & pop" shop, NOT connected to any of the big names in the muffler kingdom.
I go to a place locally called "the muffler man"...nuthin' fancy, just a dad & lad operation in an old gas station. It's dirty, disheveled, & the "waiting area" has OLD magazines form the long ago.
They do TOP NOTCH work, & can actually think outside the box....
I don't think they even HAVE a computer.