It seems there is a hole in the muffler market for the Brodak 40. I can't find a good, lightweight tube muffler. It's either the stocker or nothing. There is a chip muffler available, but I like the sound of tube mufflers better. Scott Dinger can custom fab one, but I think there are enough Brodaks out there now that a good tube muffler might sell.
I'd buy a couple.