So I put my battery back in my bike after its winter rest and fired it up only to discover that I now have this strange rattling sound coming from my exhaust that is wasn't making when I put it into storage. I have a slip-on D&D with the stock headers. The noise sounds like there is a small pebble or something in the area of the shift lever, where the pipe actually slips on to the stock exhaust system. I removed the pipe last night and was unable to see anything in there. It does not make the noise when idling, only if I throttle to about 3-4K and let off, it makes the noise on its way back down at around 1-1.5K and it rattles for a very short time and then stops (it did this with the pipe removed as well). I've checked every nut, bolt, pin, screw, etc. and none of them seem loose. Any ideas??