From what I saw, the bolts broke. The top bolts on the horn broke and the welded in nuts on the front of the horns (actually that box part) pulled out of the frame horns. I don't think the bumper broke at all. Stange thing is, I have pulled like hell on that front bumper. Probably 20 times that day alone, with no problems. I wasn't pulling you all that hard. At least it didn't seem so.