I have a 2010 Kia Forte. I paired my stock DInc pretty easily and the car automatically downloaded the phonebook. But after I rooted, flashed froyo ROM, flashed different radio, etc., it took longer for the phone to connect to the car and a lot longer to transfer contacts. My car has to transfer the contacts everytime, too which always takes a few minutes.
Downloaded bluetooth file transfer app and tried to download phone book to my car ( 2009 Nissan Maxima). The phone said that the device does not support
FTP or Obex file. I am assuming it was referring to the car system so I guess I am out of luck. There might be an update for my cars system so I will call Nissan on Monday to see if they have any answers for me.