Stumbled upon an old thread, but thought id pop in.
As in post above, H&R springs and Bilstein b4 is what i run, it handles as a totaly different car than stock, with good ridequality.

I dont think it was the goal of the threadstarter, but when you put a diesel in there with 500hp + you need something better than stock around the corners and regarding brakes

Enginebay | Mercedes-Benz turbo
https://www.youtube.com/watch?v=190nqVM9txg
100-220km/h something pul (speedo lacks about 20-30km/h depending on speed)

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daily: w123 om602turbo 5speed 200whp, w115 240d 3.07 differential
mbturbo.com turbo diesels+gassers in oldtimers/classics