I haven't heard of any other reason to remove the baffle, other than attempts at increasing performance. Maybe leaving the baffle in place will trap more exhaust heat and burn off the smoke oil better?!?!?

I've seen aftermarket mufflers with smoke 'coils' which preheat the oil before injection, and compared them to bone stock and simple B&B exhuast diverters with a nipple near the mounting flange...and I couldn't tell a difference in smoke quality at all. The difference that at times you CAN tell, is that the preheating coils 'can' decrease performance similar to baffles...etc.

Chad