2003 cars and CD Changers

[ViO]

re-Posting this in the proper forum (it was in a reply to my post in the show and tell) -

I would like to install a 6 Disc CD Changer in my 2003 Boxster... Now the one at suncoast (CD Changer Porsche CDC-3) says..

"Not compatible with the MOST Bus System, and therefore, will not fit cars made after 8/02." (which i have, since the car is an '03 with Bose and the 223 deck) Do I just need to order a wiring harness and some type of adapter, or a totally different CD Changer, whats the deal with this? ...Thanks in advance