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Chevy Silverado muffler and/or exhaust is rattling

Possibilities in order of likelihood: The heat shield on top of the muffler. Check and secure as necessary. One of the catalytic converters is breaking apart, and chucks of the ceramic blew into ...
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Chevy Silverado muffler and/or exhaust is rattling

It just sounds to me like the inside of the muffler has deteriorated and is now rattling. About the only "fix" for it is to replace it.
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