Thought I would write (will take pictures) of my efforts to bring AUX input from the front to the rear of the vehicle. The easy way (maybe?) would have been to run a cable from the glove box to the drivers side rear where electronics are. Instead I am planning on: (hoping this this will work)

1 - making two cables - one with a female mini stereo plug and one with a male mini stereo plug.
2 - connecting the leads of the front cable to the AUX jack. This would happen in the glove box. The three leads would be connected (with pins) to the CD changer cable connector sitting behind the HU unit.
3 - interconnecting the two CD Changer cables sitting in the center console. Only three connections will be necessary. If I am correct with the assumption that one cable goes to the rear of the vehicle and one goes behind the HU.
4 - connecting the leads of the rear cable to the CD changer cable which is sitting right next to the Sirius Box. I believe its purpose is the the CD changer in the center console.

I am lucky that I have both sets of CD changer cables already there. Not sure is this is standard with all of the E83's.

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E83 - Aero PKG Mods installed: Homelink mirror. CIS-IBUS video module, AUX, Rr Dr Release, stock wheels, Remote start, CarPC (Atom) & mud flaps - NAV - MKIV - NA Map DVD - 2011
E46 - 18.5 wheels/tires (summer), 17 stock (winter), Homelink, NAV software upgrade, BMW video module, Radio to V53, AUX, USB IBUS interface,BMW alarm install, CarPC(Epia), remote starter, tank battery & angel eyes. NAV - MKIII - NA Map CD - High Version 2008.1