This should lead you in the right direction! :
https://www.ramspeed.com.au/2013/10/...-kw-coilovers/
http://www.autoevolution.com/news/kw...ery-67221.html
https://www.turnermotorsport.com/BMW...-coilover-kits
Having the adaptive suspension makes things more tricky. As well as having X-drive.
Seeing as most kits are for cars without either of them.
It's not like this is the ONLY model ever made with adaptive suspension or 4WD to come out of Bavaria.
Surely a seasoned tuner-shop that specializes in "ze Germans" could make it work with a little financial incentive
