I did the same on my 560SEL, the resonator had rusted where it entered it on both sides so I cut it off and welded in two straight pipes in place of it. Compared to $326 my price at the dealer for a new one? No thanks I'll be cheap and remove it. Its similar to the exhaust on the later SD's. only a slight deeper tone noticed, not bad at all, but my oh my did it sound badass with only the downpipe on it when I was fixing it lol.

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1980 500SE/AMG Euro
1981 500SEL Euro
1982 380SEL
1983 300TD
1983 500SEC/AMG Euro
1984 500SEC
1984 300TD Euro
1986 190E 2.3-16
1986 190E 2.3
1987 300D
1997 C36 AMG
2003 C320T 4matic

past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350