Glad to help. Do you own or lease the vehicle? Upon return, modifications on a leased vehicle have to reversed. Also - what's your budget to replace M Adaptive suspension? When do you want to do it?
1. I am not a big fan of coding out errors but others have done it. Please search Coding and Suspension forum.
2. Take a look at KW V3 coilovers and select a kit for vehicles with electronic suspensions. Your vehicle is supported. Quick call to KW is always a good idea before making a big purchase.
http://www.kwsuspensions.com/product...-3522000g.html
3. The reason why I mentioned earlier that timing may be important is the announcement from Bilstein about availability of B4, B6 shocks and B16 (my longer term choice) coilovers.
http://f30.bimmerpost.com/forums/sho...ght=damptronic
I called Bilstein USA to verify availability. Not yet. But Bilstein Germany catalog shows availability and "In preparation" status.