Dan, those joints are supposed to leak at cold temperatures. The short stack and the muffler are interference fit and the clamp should be installed in a way that after the pipes are hot they will not leak and if they leak even slightly the clamps are there to block any torching or fire streaming to damage other parts, hoses, lines etc..
You would not need any glue, tape or anything between the clamps and the pipes. Actually those you put in will burn off at 1600 degrees and may cause fire hazards. I hope this helps.
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