I went ahead and sourced a rear muffler since I have to relocate the scoop in the lower rear panel. I want to be sure I have to right radius and height. The first thing I had to do was make some band clamps to hold the muffler up. I resorted to my boat building days and made the band clamps out of carbon fiber bi-directional tape with epoxy resin.
Tomorrow I will be able to clean them up and fit them to the underbody.