Nothing fancy just smear a little high temp silicone on the inside of the muffler and slip it on and clamp down. Most of the high temp I have seen is red but Permatex does make Ultra Black high temp. It is black and meets the same temp requirements. I don't see it very often though.

I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!