Is an adapter expensive? From what I've read a lot of people hate the bose system. If I got the nav I would like to keep all interface aspects and the awesome OEM look but change out the speakers.
The position of aftermarket navs was also a concern to me. I don't find it safe having to look down to view the map.
Anything else that an after market DDin would do better than the stock OEM nav? can you BT music from an iphone or would you have to USB it?
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