Hi Guys.
I am about to purschase a bmw z4 2004 with nav.

It has maps on the flip up screen and is controled by what looks like a cd player with a knob on each side.

there is a a place to put a cd dv (not sure which) in the back on the middle of the armrest.

Which unit am I running?

Can it play mp3s?

Can it be modded to do so?

Can i burn my own maps dvds?

Any idea how to get a lets say garmin map an convert it to the bmw format?