With so much concern about exhaust joint failure, I have found a clamp (approx 2 bucks) that fits well, and is robustly made, which can serve as an emergency-use or replacement clamp if needing to split the joint on your scooter on the road, etc.. These clamps are even used by a Baja race team I know of, on their exhaust system and they swear by them. It is stainless steel, and I'm tucking one into my parts-roll just in case.
It is a Clampco 94-100-0150 B07 I purchased mine at McFadden-Dale hardware in Corona CA, with shops in Anaheim, and Ontario Ca, but i'm sure any "real" hardware store anywhere can source.
Between this clamp, and either a new single-use muffler packing, or a Moto Amore muffler bearing, this just may be the ticket between riding, and walking. I haven't had to put this into service, but it's a great fit on the joint, and as I mentioned, I know Baja racers that swear by the same clamp....so I thought I'd pass along.