You will need to buy a new combo module if you want both in an '04, or delete the Assist and replace it with a bluetooth only module (which runs a little less $). Search the forums for lots of info. on the subject.

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'06 X5 4.8is, TiAg/black, cold weather pkg., comfort seats
'07 750Li, TiAg/black, sport pkg.
'05 Ford F350 silver met./slate gray, Lariat, 6.0 PSD, CC, DRW, FX4