Do your have an Idrive system or normal professional CD tuner? If the latter, the Bluetooth was built into the unit on later spec cars, so you would not have a MULF unit.
Someone correct me if I am wrong.
Mods so far: 20" LM reps, Eibach Sportline, LCI tail-lights, LED H8 angel eyes, black grille, Black BMW badges, CIC/Combox/Bluetooth/6FL/6NF/6NR retrofit, rear headset monitors and PS2.
Awaiting iPhone 5 music/media snap-in adapter.