Whats a real Mercedes muffler cost???

I have a question on my muffler on a 85 500sel Euro I have heard there are front rear and rear sections. Is the middle section a box type that has the two tail pipes going to it? If so what does it cost to replace this and the muffler with a real Mercedes parts. Do real Mercedes parts last a lot longer than Midas stuff.

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Dan Younes
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1985 euro 500sel 223k
1986 420sel 86k soon 2 be
1981 300sd 285k sold
1979 240d 298k sold
1983 300sd 272k sold
1989 chrysler 2.2l Turbo
Leabaron 140k
1989 Dodge Carvan Se 295k
1994 S500
(hopefully someday)