It is a plug and play, you might have some issues if you dont have widescreen, but with factory 16:9 wide mk iii to mk iv is jus a swap
PS. Wait for the red light on mk iii to go of before you dossconect it

__________________
X5 4,4i-06 Current
330Ci Cab-03 2007-2008
MB E55 AMG-03 2006-2007
Z3 2,8 Roadster-98 2006-2007
X3 2,0d-05 2005-2006
320d-99 1999-2005