I decided to adapt a universal Super Trap muffler so I can adjust the sound & the torque curve . This muffler filled the bill , it was a real pain to make it fit but well worth the effort ! The sound with its standard 12 discs sounds great . With ear plugs at 70 mph you don't hear the exhaust yet it is very loud when you crack it in the garage . I had to open the inlet up a little to go over the cat . I took a mount off & old street muffler & welded to the supper trap . I also removed the finish off the new pipe & painted it with black high temp header paint that had to be baked to cure . I have done only one 30 mile ride & it seams only a little lean . I will get the HD SE tunner & fix that .