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Yeah, trying to retrofit factory Nav into a non-iDrive car isn't a fiscally wise decision; if it's a must-have then make sure it came that way from the factory.
I don't know the 330, but you might check with Crutchfield.com to see if there's any sort of aftermarket in-dash nav upgrade you can do. They're not the cheapest place on the Internet but they have great customer service and tons of info on what can and cannot work for various cars.
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