Say you are a blithering moron who can't tell the muffler from tail pipe or something or the other and would not want to be ripped off for no other reason than that you are outside your realm of existing expertise then you want to go here. They are not rude condescending or stand off-ish abd they do not sell you services you just do not need. Not only is their service excellent and swift their rates can't just be beat.
Now a word of caution, they are busy so do call ahead and make an appointment or be prepared to wait a long time. Superlative service by honest men. Definitely going back when I decide to replace the exhaust system on my truck