I prefer the stiffer ride as i like to drive fairly aggressively and 'throw my cars around' a bit (within reason!:-) I know for this i should probably be driving a VW golf and not a Merc, but I'm not a 'boy-racer' as we say back in the UK.
I do like my cars to have good solid handling and my old Peugeot had good suspension (for French farm roads i'm told) so i'm used to the firm feel.

Rear seats didn't have to come out, thankfully, just the trunk liner on each side needed to be pulled back. Not a difficult job- took me 4 hours as it was my first time ever and the bloody nuts were being stubborn coming off.

The car doesn't wallow like a big whale going over hilly country roads now:-)

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1993 320TE M104
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past:

1983 230E W123 M102
1994 E300D S124 OM606 (x2)
1967 250SE W108 M129
1972 280se 3.5 W108 M116
1980 280SE W116 M110
1980 350SE W116 M116
1992 300E W124 M103
1994 E280 W124 M104
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"music and women I cannot but give way to, whatever my business" -Pepys