While the pipe is cool. check to see if you can rotate the muffler. Alot of time the torca clamp will not re-tighten after it has been used and you will need a new one. you can get them for about 10 bucks
I suspected the torca clamps before when it was poppin'. I have asked at every HD dealer in town 3 of them. They have to look up the part number and never have them in stock. That leads me to believe that they don't get replaced that often. I will pull the baffle and see if its loose fit. What you guys bending them out with?
I pulled the baffle out today. Over half of the packing is burnt away. I have put about a thousand miles on them since I put them on two months ago. I got them from the dealer so they will check with Epiflex Mon about replacement.