RE: muffler bolt removal
I love it. Just what type of drill bit are you guys using to drill a hardened socket head cap screw? Cyberwolf, the whole screw is hardened and difficult, at best, to drill. Gonna ruin a couple of drills there. Y'all either got some cheap screws or some darned good bits. The cutoff wheel works the best, either for slotting the head for a screwdriver or for cutting it off entirely.
As for collateral damage to the engine, Work carefully. There may be an extra slot or two in the case when you're done, but there's usually plenty of meat in that area for it to not be a problem.
Dr.1