Somewhere up there on the body, there is a rubber buffer that prevents this bang and clunck. May be you lost that rubber buffer.
You can find that at fastlane or PP. There are atl east 2 places where I have seen these buffers under my car. One or both of them might have been lost or rotten. Search under exhaust and look for mounting accessories etc..

MVK

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1985 300D Turbo 179,000miles