Dinan suspension lowers the car around 0.5". People seem to think it yields a good ride quality but for that slight of a drop I would stick to the stock suspension. The Clubsports are adjustable. You can dial in softer settings for street use if you desire. I have no regrets switching from Eibach springs to clubsports (from a daily driver perspective).
'08 E90 M3 - Alpine White - Sold
'13 E92 M3 - Silverstone II - Sold
'04 E46 M3 - Jet Black - BBS E88, KW Clubsports, Brembo BBK, SuperSprint Exhaust