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heat shield somewhere in the exhaust system.

a loose bolt somewhere.

How do you know the sound is from the muffler? Under what conditions does the sound occur?
 

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Super Moderator
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So you can only hear it when stopped, which probably eliminates most suspension components.

Loose heat shields on the catatlytic converter (or elsewhere) would be one possibility. Have you climbed underneath to see if you can see anything loose? Can you get underneath with a stethoscope (or long screwdriver) to see if you can pinpoint where the noise is coming from?
 
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