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Faint rattling soun...
 
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Faint rattling sound (muffler?) 99 Camaro

  

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Mostly hear it while idling. can only hear it from outside the car, not inside.

Think it's the metal rods that hold the muffler up.


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Could it be a loose heat shield somewhere? Mine started to rattle over the cat, I drilled a small hole in the corner where it was loose and bolted it back together. Check around the system for any loose heat shields. I think on those there's one by the muffler, and one where it goes up & over the rear axel. Those types of rattles are usually like frequency (rpm) dependent. Mine would do it around 2k pulling up my steep driveway. 


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