For those of us curious as to how the REMUS exhaust looks on the 124 body:
http://www.dhc.net/~pmhack/mercedes/300CE902.HTM

No, it doesn't stick out past the rear bumper, but I believe the bottom of the muffler looks like it below the rear bumper.

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'87 300E
'88 560 SEL
'98 SL 500