Worm, most Meineke Discount Muffler Shops (which is were I got mine done) are open on Saturdays. I was going to get mine done a couple of Saturdays ago, but since I nor the muffler shop knew how the tow hitch might interfer, they suggested that I wait until I got that installed first (which was this past Saturday).

I went to the shop on Monday, but they didn't have the muffler (FlowMaster 524562) in stock. They got it overnight from their warehouse and so today was my fortunate day.