Originally Posted by AlanAZ
Performance pkg comes with shorter bump stops for lowering springs, I used those. Anyone installing lowering springs, or in this case a lowering perch, should consider shorter bump stops based on the drop, there are several avail: Z3M, E90 M3, and presumably the one on mine. Inexpensive part of tuning your suspension.
Aren't you worried by using the shorter bumps stops they will compress more than the stock e9x bumps stops? My concern is that your tire/wheel can then travel up higher in the wheel well under full compression and rub or even crack a fender.