Just some questions on the slr lift options (econ line, stage 1-3). Which kit is better? I already have the stock length front bilsteins (20% stiffer) and the rear 10" bilsteins (stiffer), and calmini shackles. Will i need to get longer shocks if i get the stage kit (1-3)? They seem to push the front shocks with the cnc spacers, do i really need them? Could i just get the new spring pack and the stage 1-3 control arms with the diff lowering kit, or will that give me too much travel so i will need the longer shocks? Lastly how much real lift will i get with each kit? thanks for you time everyone.