rattleing sound

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SAM100
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Hi
I have rettleing sound under the car mb mecanic opinion is rear muffler
He thinks some think broken inside rear muffler
I need second opinion
There is not a rattling sound on natural (step on gas) or on stop
Only when car is on motion more around 40km
The vibrating sound is around catalytic converter
And it gats better after 30minuts drive
Thanks

1997 mercedes c230
Feb 1, 2007 at 5:23 PM
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SERVICE WRITER
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Well it has a heat factor involved that results in a change of metal flexing, There may be a heatshield that is on the loose side.
Feb 1, 2007 at 5:34 PM