So which lowering springs offer the best ride comfort. I know there is a sacrifice, but are some springs stiffer than others. I know for the M5, the Eibach setup is a little more forgiving in terms of comfort than the H&R setup, similar drops considered of course. Is there a difference in terms of ride comfort between the companies that offer us a setup (Hamann, H&R, etc)?

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'07 M5 Blk/Blk
'10 X5 35d Monaco/Tobacco