W,

I suggest you try the car out for a bit with the rear suspension untouched...you may be surprised that the rear will step up to the task. In a road car, do not dismiss the value of maintaining the car's attitude (in this instance I mean the fact that the car's rear doesn't dip under load) not only for suspension reasons but also your headlights pointed safely where they should be. Also consider that the 500E/E500 came with a self-leveling rear that I think works quite well...even throws a couple thousand PSI to the rear struts under hard acceleration...the car doesn't squat like you'd expect.

Try it out; you've nothing to lose.

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Best regards, Michael
'92 500E
'88 300TE