Muffler hanger broken
The muffler is attached to the vehicle by hangers. If a hanger becomes detached, the muffler can swing and bang against other parts.
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Muffler Makes a Rattling Noise
If a muffler hanger is broken, the muffler can bang against other parts. If the noise is greater during cornering or over bumpy roads, the muffler's momentum can keep it hitting other parts for a while.