Look at this auction. It sounds like it's leaking in the same area from the way it's described, but I cant imagine muffler patch holding...
"There is a patch of muffler wrapping on the flexible exhaust manifold joint. It does not make any noise. The entire exhaust manifold needs to be removed to replace this flexible section."
 Mercedes-Benz : 300-Series sedan in Mercedes-Benz | eBay Motors
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1987 300SDL #1, 1987 300SDL #2, 1980 240D, 1982 300SD, 1994 S350, 1990 350SDL, 1991 350SD, 1985 300D, 2005 E320CDI
Gone, but not forgotten: 1981 300SD, 1982 300SD, 1987 300SDL, 1983 300TD, 1980 300CD, 1981 300SD #2, 1987 300D, 1987 300TDT, 1980 300D
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