When racing the Road Sofa, I looked back after a run and noticed that my muffer was hanging a lot lower than usual. It turns out that the hard braking and cornering of the autocross was enough to make the exhaust slip off of the rearmost hanger hook. I laid down on the ground and put it back on with my shoes, since I had no gloves and it was ludicrously hot, but it begs the question:

Why are exhaust systems attached with flimsy hangers instead of something more robust? Why not have flanges welded onto the pipe that bolt right to the bottom of the car?