Hi I have spent all day speaking to people who are very knowledgable in repect of z4 e89 2010 audio upgrades and have seen more initials than anything else, I am now in a state confusion . I have fitted the original idrive system which has a controller , it answers my phone and has a usb and aux in the centre consul . It also has a CD which does not appear to work no Dab , no streaming and a very dated Sat Nav, I have the following questions . Would this be classed as a CCCC or CIC as it appears the upgrades are different for each type . I am adviced that I can fit a Mr12volt system MMI which fix all of this , what is an MMI . I am near to 80 than 70 with little audio BMW knowledge . IS the MMI better tban the Ugode system which it appears is well thought of . Please feel free to treat me as an audio idiot.