I remember when you got this setup to retrofit BT - I think you found out (as I did) that cars with build date of 2/2009 do not include the prewiring. Although it was uncertain to me at first, since it was repeatedly reported that cars up 2/2009 had the prewiring (apparently it is up to, but not including 2/2009 build cars).
I have the MULF2 installed in my car underneath where the TCU usually goes (as I have the USB interface) which has the large blue connector, black/green fiber optic, & the USB coax - but no loose large white connector and the rest of the TCU wiring. I do have a bundle of still wrapped wires coming off same harness as going to MULF2 - but I think they are for the optional CD Changer.
You were gonna go with the mObridge - did you finally go that route, and how did it work out? EAS lists mObridge for 2006-2008 cars only?
2009 328ix E92//SGM//ACS Roof Spoiler//MTech Aero Lip+Trunk Spoiler//M3 Side Skirts//CF Roundels+Grilles//M3 Novillo Interior//Perf Shift Lever+Boot//MPerf DCT Wheel//M3 GT3 eBrake Handle+Boot//ACS Pedals//M3 Mirrors//LCI Tails w/LUX Rev//DTEC V7 AE+MTec 6000K D1S+HPB HID 6000K Fogs//HPB LED Interior//RPI Scoops//CF Euro Airbox+Underhood Hsgs//K&N//BMW PE//MTech Rear Bumper-iS Sport Diffuser//CF Strut Brace//Vishnu OFT//BMW 193M's+Kumho 4X