I have telephone option and assist option. My car was bought from a non BMW dealer and they had taken the navi etc. out and transplanted into another x they sold. So they promised me a navi. Well all they gave me was a navi, no cd changer, no BT. I know it had bluetooth because previous owners past calls were listed under telephone option. Cost wise do you think it is a better option to just upgrade to aftermarket to get all these options. I have seen the new Pioneer avicf90bt for like 450 on ebay plus 250 for the bezel...that would definately be cheaper then buying all the OEM components correct?