I've never found that any of the aftermarket mufflers sound right on a Mercedes (Walker, Borla, Bosal, etc.)....but they don't cost as much either. If yours is worth saving, and OEM, just pop over to the nearest muffler shop and they'll weld you up a patch pipe and reinstall for probably under $30.00. If you're able to weld yourself, get a piece of repair pipe and MIG it on. You might need to make a flange first, and weld the patch pipe to it, then weld the flange to the end of the muffler itself.

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1986 560SL
2002 Toyota Camry
1993 Lexus