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On a 330 (according to you signature), you get Logic7. Logic 7 is not compatible with any aftermarket headunit. There are no adaptors (currently) and its a rather nasty digital bus (MOST for Audio and entertaintment). Plus the wiring for a conventional headunit is not there (no ignition lead, no speed puls, the powerline is switched on lead 30g) etc.
Unless you do some MAJOR modifications, an aftermarket headunit is out of the question. I put an aftermarket headunit / navigation in my eurospec 330 with had no Logic 7, not even the hifi-setup and a simpler than US stock radio (the so called Business radio) and it still was a pita.
In short: If you think aftermarket nav is easier or cheaper than the i-drive setup: Fraid not.
YouŽd be better off either opting for the factory nav or a seperate Unit such a a garmin, tomtom or pda-based nav.
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No, not THAT kind of tierfreund!
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