Please keep us posted with pix. If you can give us numbers on how much it lowered your car on both ends, if any, that would be great too. I'm thinking the performance springs may be shorter b/c it is stiffer.
I have the base suspension springs right now and the E90 Aftermarket Suspension Guide says the ZSP lowers it about .6". If the performance springs does lower it more from the ZSP springs than I can potentially lower my car to about 1" with the performance springs?
I asked Jason from Tisher but he was unable to give me with a definitive answer.