I found this recently found this in my carport. I suspect it came out of the exhaust of my ‘92 300TE. Do you know what it is?

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David
1986 300E Anthracite + ECodes + MB Mileage Award

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
'91 300E-Went to Ex
'65 911 Coupe (#302580)

looks like the baffler plates inside of a muffler to me ...

With the car out of the garage: stand approximately where you found them. Look up. Do you see sunlight or a hole in the roof? If so it's some sort of meteorite.

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89 300te 222,222
92 300e 190,000

Does your car have a inner hood pad?

could be the innards of your catalytic convertor .sorry for the bad news

Definitely not Hood Pad. Cat would be bad. Could Cat make it through the system?

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David
1986 300E Anthracite + ECodes + MB Mileage Award

I'll go with the baffle theory.
Just can't see how pieces of a catalytic converter could make it all the way through a muffler.

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2007 C 230 Sport.

They look curved. Cat pieces wouldn't be curved.

Looks like the sliding mesh exhaust seal behind the cat is flaking off. There are two seals , one is a hard steel donut ring and the other is a mesh type that floats so that the expansion rate of the pipes is isolated behind the cat... check there ,, it will be the outer/passenger side one. The inner is a solid fixed joint.