Im surprised the dealers actually keep there jobs if they give information like that out, the service guys know bugger all about there products...The Mfd2 DVD is a straight retrofit with no additional wiring needed. The only thing you will need is the GPS antenna and the code for the nav unit, the quad lock connector is already setup for the nav unit so is plug and play, but your car will need a little bit of VCDS coding so if you know someone local to you to do it then a beer might be in order for that person. Im saying that it needs coding but it will work without coding it but it will show incorrect coding if fault finding at the dealer.
Darren