Originally Posted by Nathan_h
Afaik: One way to tell whether you have the combox or MULF if you can't visually see it is to see whether a regular iPod cable (not the bmw dongle) and an iPod with mp3s will play over the stereo. If so, it's the combox. If not, it's the MULF.
Great tip! I just tested mine and apparently I do not have the combox.