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Well, there is a pretty huge difference in ride quality. The ZSP is much firmer and crashes over sharp bumps. The runflats make it very uncomfortable. Without runflats, the ride is much better.
As for handling, the balance of the non-sport is better than sport, which is kinda ass backwards. The grip level of the sport suspension is phenomenally better but there is quite a bit of understeer. At 6 tenths, it's really fun to drive the ZSP cars but 8 tenths and beyond the car is rather irritating to drive. You have to be way drastic to get it to rotate. You can remove the front/rear tire stagger to significantly improve the balance and retain the grip. Just put a 245 or 255 size tire on the front wheels (use a pair of rear 8.5" wheels).
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--Marcelo
'06 Arctic Metallic 325i | Sport Package | 6MT | Dinan Stage III suspension | Dinan exhaust | 330i manifold swap! Click here! | Active Autowerke tune | 135i Brake Calipers | Deiselboost caliper brackets | E46 M3 front rotors |