RE: Muffler keeps coming loose
This is a problem with a lot of gassers depending on the muffler type. If the bolts are crushing the muffler it is doubtful that wiring the bolts heads will help. Use large, thick steel washers or a piece of steel plate to stop the crushing potential. Not sure if your particular muffler has any supporting straps on the far end but this is what a lot of muffler types need to prevent them from shaking loose, particularly Pitts mufflers.