Took the plunge and ordered the BlueBus for my 2003 e53. On my 2003 I have factory nav with DSP and the CD changer in the back. There is no ULF or TCU in the back and no option for phone in the menu on the nav screen. I'm assuming there will be no microphone in the front console either. Also, IIRC my '03 does not have the coaxial connection between the CD and the DSP. It is more than 10 years back that I did a nav retrofit on the 4.8iS I owned back then and at the time I also knew exactly what was in my '03 but those memories are vague now.

My question for anyone who has installed their BlueBus, any clues on which cable/harness I'd have to obtain to install it? I'd like hands free calling to be available as my kids will mostly drive this car going forward. From the posts above it looks like there is more to that than just plugging the CD changer plugs into the BlueBus?

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2003 4.4i black ext./black int./black headliner (kid's runabout)
2014 535d X-drive, M package, silver/black interior

Sold but not forgotten:
2009 E70 35d, black ext./black int./black headliner (sold 2021)
2006 4.8iS Le Mans blue/cream int./black headliner, SOLD in 2012 sadly...

Other hardware:
2015 Cayenne S (wife's new DD and definitely wroooommmmm)
2016 Tundra 1794 edition crew cab, luxo hauler
2005 Tundra crew cab, weekend hauler. Sold after 150k very happy miles.