Attached is a one-page PDF of the info I have on the Porsche iPod (Musicplayer) interface. The summary is:

* Audio in from both an Apple dock and a 3.5mm connection
* Located in the center console storage bin
* Presumably, power available from the Apple dock
* No ability to see any track info on the PCM - it just shows 'iPod'
* No ability to control the iPod on the PCM (apart from volume)

This seems essentially to be a Aux-in and no more. The iPod display and touch wheel is not an ideal interface for control of the iPod while driving, whereas the PCM display and buttons (and remote steering wheel controls if you have them) are much more useful.

These third-party boxes plug into the electrical supply for power (via a fused wire), and are added in-line in the fiber optic MOST ring, but they don't plug into the _electronics_ per se.