I just undid my Bavarain Auto Sport Spring and Bilstein Sport Shocks after less than a year of abuse. The rear shock s failed on me but rahter than try it agin I opted to go back to orignal ride height and boge rear shocks. I kept the front Bilstein inserts and OEM springs. Happier with the OEM ride but I do miss the agressive look my 540i had before. I guess I will just have to go with a supercahrgin kit to make up for the lack of ground control. LOL!