Wonderful, this was very helpful. My own install is a little bit different (though I have a similar car 323Ci), I want to install the Car2Pc in the trunk using the cd changer wires and get rid of my head unit all together. Do I follow the same instructions regarding the wires to T-Tap as well as using the other (black) connector? I'm not sure what the connector on the CD-Changer wire looks like or if it differs from the HU connector, so any help would be very welcome. Also, what potential pitfalls should I watch out for in going this route. Please any advice would be much welcome and thanks again for the tutorial.