This stainless steel clamp is the best method for clamping the muffler to the exhaust pipe. It will not stretch and loosen up like aluminum clamps. It will not deform the muffler or the pipe like an automotive muffler clamp. This one fits pipe and muffler combinations of 1 - 5/16"
Note: Sometimes the muffler fits too loosely on the pipe. It may be so loose that the muffler clamp won't tighten enough to hold it securely to the pipe. If you have this issue you can cut metal from a tin can or aluminum soda can and wrap the pipe with it to make it larger before you slide the muffler on. With the muffler clamp tight you should not be able to wiggle the muffler on the pipe.
Always safety wire the muffler!