The MDI is for the new generation radios and doesn't work on the MFD2. The iPod adapter I have plugs in to the CD changer socket (and you lose the CD changer) and you can then access playlists as if they are CDs 1-6. It will also allow you to start playing what you want and then just plug in the iPod. I was told by the dealer that it's very hard to get the aux-in working hence the cd changer solution.