Dear ZRoadster.org, I have a 1998 2.8 Z3 (engine tinkered up to about 280 BHP) with Bilstein B4's fitted 18 months ago (the OEM one were shot to the extent that the tyres rubbed the inside of the bonnet when cornering!) & the B4's made a huge difference. I have since fitted Powerflex subframe mounts (polyurathane) & have replaced virtually all the bushes I could find. I am looking at upgrading the tyres to Toyo Proxes R888's on 18 inch wheels (225 front, 255 rear). I would like to further reduce roll around corners, so am considering a set of Bilstein B12's...has anyone fitted a set to their Z3? How are they interms of ride hardness (too extreme??) & corner stability? Also, I do not want the suspension lowered significantly if it can be avoided. B12's come in two versions: Pro Kit & Sports line, but am not sure what the difference is?! My car is a 'weekend fun' car for the road, not track, so I don't mind a hard ride, providing it does not split the subframe! The roads here are very good, with almost no pot holes etc & I only drive my Z3 in the dry (top down of coarse!). Any views/experience of B12's on a Z3?