Are the ZSP springs you refer to the same ones that come with the BMW Performance Suspension Kit (getbmwparts.com), and the ones you feel are not quite stiff enough? And when you say "Performance" springs, are you referring to something like your Eibach or some H&R? What did you start with when you bought the car, the ZSP package?
Originally Posted by cssnms
I would not recommend it. At least buy some ZSP (sports package) springs to pair with the performance dampers, but even then the springs are not quite stiff enough, but certainly better then pairing with the base springs. Otherwise, Performanse springs paired with Performance shocks.