I had a rattle going on in mine too. I removed the stock trap and used a very long screw driver to knock the element out of it. I reinstalled it, and had no issues at all. Everything looked stock. You can do this procedure yourself and not have to spend any money to repair it.

Eventually, I replaced my entire exhaust with a 3" straight pipe.

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Ed
-1984 Mercedes 190D 2.2 5-speed gray market(bought@30,000 miles) (Sold back to original owner@170,000 miles)
-1999 Mercedes E300DT (245,000 miles)
-1999 Mercedes S500 Grand Edition (80,000 miles)