I am new to the forum so hello to everyone. I have a Japanese specification E60 525i. Whilst I am pleased with the car I would like to upgrade the CCC system to get the sat-nav working. I have come across a system made by Dynavin which replaces the idrive screen giving GPS, bluetooth connectivity etc. My question is "has anyone installed this system? If so is it as good as the website suggests?" Further is there any reccomended auto electricians who are trusted enough to install this system? Many thanks for your replies and assistance.