i'm assuming there has to be some differences between the 328 vs the 335. There are separate part numbers for them from eibach which would mean they had to have different spring rates or overall spring height.
For eibach they have one part number (2092.140) for the e90/e92 335i (kit i have). This should get 1.4 front, 1 rear drop.
For 328i, there are separate part numbers for e90 (2085.140) and e92(2091.140).
Just using what i found out on eibach, assume things are the same for the other springs out there.
Last edited by critical05; 05-09-2012 at 07:37 AM.