Hello, Hope you don't mind me visiting, but I normally reside in the TT-Forum. I was advised to come and chat to you guys as you know your stuff . Here is my dilema. I have an early Jan registered 2002 225 Coupe, so probably a late 2001 model. I have just found out the HU was not originally fitted with the car, as I got the manual out and it is for a Chorus (with double kn0b). The concert I have fitted has the volume problem so need to change anyway. The issues are - there is no dash display, does not turn on/off with ignition,and turn off after 2 hours. I thought this was normal, but now I have found out this is not so.... I have also been told that if this HU came from a non Bose car, then it will not be working mine?? I want to change to the Concert II. Will I be able to just change over, will everything work inluding Bose and CD changer, and are they all the same size for the Concert II, they look the same on e-bay?? Will I need any more wires etc - what's this can-bus thingy people go on about, do I need one? Hope you can answer my questions! Help me Obi-Wan Kenobi your my only hope!