I chopped off my mufflers and replaced them with slip on mufflers. I have a 450. They have baffles of some kind, sound louder than stock, but not raspy or annoyingly loud, just a deep bob bob bob bob type of sound. Bikes drives well, didn't need to rejet or anything so far. Cost me about 100 euros for the pair.
Because they were cut where the mufflers weld to the head pipes, didn''t have to worry about any studs breaking in the head, or pipes re-routing and burning legs!
1986 Rebel 450, a little bit bobbed here and there!