.."BMW radio install harness"..converts aftermarket to BMW plug-in..really cheap too!(thought you'd like that)..and if you do,yes the 6-play is toast(Ebayable)...or why not upgrade to the BMW single -cd alpine unit?(about $275)..it sounds better and will operate the trunked cd/unit..Choices! Choices!..Z3 Cheers! dk '97 2.8 bg R