I can get Stock mufflers for about 50.00 locally, so I am, going to pick up a set, and do the drill out and debaffle, WHILE they're off the bike. There is a nice video for doing it, I watched it and know how it is done, I won't have to watch it again, VERY SIMPLE...
You use one of those big wood drill/saw things you use to make holes large enough to install door locks and door knobs. When you drill the metal, it falls right off/out. Then all you have is the baffle in there. You then clamp on that with some vise-grips, move that piece up and down, side to side, around, and around, and keep going till it breaks loose, and comes out. Then you have loud exhaust...
You "can" get away with the drilling the plate off, leaving the baffle in, it just looks wierd, but I have seen some Harley pipes that look like that...