the only advantage to the mac baffle being removable is to be able to repack it when the inside packing wears out. If you ask me the damn thing is loud enough to piss off neighbors without the baffle removed. If you really want to be obnoxious, mac makes drag pipes for the cb750, they sound better than a mac with the baffle removed.
btw, it is helpful to have a slide hammer when removing the baffle, pops mine out every time.