Basically, you're going to lose assist and BMW bluetooth if you relocate the head unit. Relocating the head unit is a way to keep the HU on the data bus, so that if the car goes in for service, the dealer computer doesn't "see" a missing head unit, or error codes for assist and bluetooth not working - and then pukes all over itself when it tries to do a software update. Retaining aa hidden head unit keeps all that working.
musicar northwest portland or musicarnw.com
Web site migration complete. Now we have some errors to correct in the site itself, and we should be back to normal by Turkey Day. Thanks for your patience.