Good luck trying to a find a Supertrapp beastly. It took me around a year to find a decent one and I still had to pay out the ass for it. I`ve turned the DG megaphone muffler into supertrapps for some of my customers. You can get a set of the 4 inch discs and an end cap and drill and tap the muffler. It sounds just like the supertrapp and is tunable.