When you get the current system up to spec again--anything requires periodic maintenance--you'll enjoy the benefits of self-leveling, which is something any conversion won't offer. Nothing depressing about that.

If you're anxious to "convert" something, why not look into different rear hydraulic struts and perhaps associated components as specified for Sportline or AMG models?

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Kent Christensen
Albuquerque
'07 GL320CDI, '10 CL550. '01 Porsche Boxster
Two BMW motorcycles