In setting up my suspension then, what are general ratios I should maintain for the diameter of the front to rear? Is there one? I don't want to drastically affect the steering characteristics.

I think I also want to replace the bushings with polyurethane since I did this in another car (not an MB) and I was pleased with the results. Who carries them though? And does this include the subframe bushings? I'd think replacing them with an alternate material would jar the body too much.

I'd also like to replace the springs with performance springs but don't want to drastically affect the height much. Any recommencations - or at least who carries them so I could get additional information?

Thanks.