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oh boy... retrofitting an OE navigation into a bimmer is a nightmare... it would be easier to go with aftermarket device...
the Nav unit is a split unit - the radio BM53/BM54 unit is in the trunk. the nav computer is in the trunk... the CD changer is in the trunk... you need to tap into speed sensor signals... the yaw signal...
it is doable... i have a factory PDF somewhere on my hard drive about the proper retrofit and the part numbers involved, including the wiring harnesses... but... why?
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