A closer inspection and disassembly of the muffler finds bad news. The wall of the muffler is approximately .30 thick and it is uniform throughout - - no thick area for potential drilling and tapping. I have sent a message to K & B to see how they can help. I don't believe there is enough "meat" on the wall of the muffler to allow a tap to work but I'll see what K & B has to say. Thanks so much for your time and efforts to help me. It is obvious that this forum is filled with people of great knowledge a desire to assist other R/C folks.