I had the opportunity to discuss this with a great race mechanic, and the only danger with no mufflers/baffles, is cold air rushing into the exaust at shutdown, and the exaust valve head could crack if it is hot enough. Just passin that on. jimsjinx
You can run without the mufflers as long as you don't mind FRYING YOUR ENGINE!! The reduction in back pressure will cause the the bike to run lean and hot. ANY change in the intake or exhaust requires a careful analysis of the fuel/air ratio (read the plugs) When you see the Harley guys running down the with loud exhaust and their pipes turning blue you can bet they are headed for burnt vales at the least and likely as not scored cylinders and pistons. I would wait until you can get the mufflers on and then go for a SHORT ride and look at the plugs and go from there.
Let the bags burn, let the neighbors be damned, to heck with the odor…. Jim's race mechanic buddy is spot on… it's the valves and head that'll burn due to cold air on a hot spot that'll cause problems. I highly advise against riding it without mufflers.