If the peices are hard and brittle my guess is you have lost inner baffling of your resonator.

I would try tapping on the exhaust system and listening for loose pieces inside.

Haasman

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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
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'65 911 Coupe (#302580)