BMW E92 M3 exhaust rattle traced to muffler weld cracks
vsix reported tiny cracks along the muffler’s upper welds that sounded like a loose heat shield. After the cracks were welded closed, he said the rattle and an irritating buzz disappeared.
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Turner valved exhaust rattle and a cracked muffler
M3MATT traced a rattle to a crack near a muffler pipe connection. The owner reported a temporary improvement after applying JB Weld, with welding still planned.