I have a 1984 318i, and the muffler tore a hole right at the exhaust pipe. I ordered one online (a cheap one) and brought it to my mechanic. He said that my old one (which was oval shaped) was something that had been thrown together, and that the new one, which was much heavier metal, was the correct one. He bought the hangers and put it on.
A few weeks later I have a hole in the new one, same place as the old. I can't understand why this would happen, especially since it seems like pretty rugged material, and it seems very straight forward to put this on.
Any ideas why this might have happened?