No I don't have an oem nav. Someone told me there is a tuner under spare tire. I may be wrong. I have not looked. So let me get this right the whole radio up front including the business cdplayer and the headunit piece on the bottom must be placed in the back, or just one of them. I'm trying to get all of this information for friend, he puts in radios but never has done one on a BMW. All of your help is appreciated. If you want to exchange phone numbers i'm cool with that too.

I know I'm probably a little dumb when it comes to this or maybe a little confused. Also i don't have the round pin connectors I have the new style.