Guys i have a 02 X5 that comes with the professional series single disc cd player radio with DSP and six disc changer in the trunk, i want to know if it will be a plug and play effort if i buy a 04 Business CD player radio to replace it so i can get auxiliary input functionality.
Dealer here claims if the X comes with professional series radio only professional series can work in it.

But my prof radio was made May 02 so not aux funct....