It's not likely that it's gonna blow up, because of an exhaust leak. A major function of exhaust, is to get the heat away from the engine. On a 2-stroke, unburnt gasses go into the expansion chamber and kinda swirls around and gets sucked back into the motor, and then burns some more, for maximum performance. So, a leak needs to be fixed. I reccommend a new frame. Don't rig it up.