well, one of my buddies decided to come over at 7:30 this morning to mark the trails since we got hammered on last night leaving a good 10 inches of powder. anyways, i noticed about an hour later my sled sounded really loud. i didnt think anything of it. it kept getting louder and louder. i looked at the muffler where it bends where it connects to the exhaust manifold. it had a crack about 2 inches long in it. i figured it would be fine until i could get home to weld it. anyways i kept riding and finally it became more noisey then ever. i now have a hole about 3 inches long and an inch wide. what could of caused this mayhem?