Nice thread here. Why are you either going back to the 18's or Bilsteins? Also did you measure the drop before/after on the springs? And did you get a new alignment after the spring install? Thanks.
Have a 335xi e92 as well and considering similar upgrade path. 19" wheels/tires, then ZSP springs, then Bilsteins + Eibach. Recently dumped the OEM RFT's for Conti's (AS) for winter use only, did not expect such a huge difference. That has me wondrnig how good this car could get with a little bit more aggressive but streetable suspension & tires.