No no no fellas...if you have option 6FL (iPod interface) on your car already, bluetooth can be retrofitted using the MULF-2 unit in the trunk of your car. This is a project I took on, purchased all necessary parts, soldered wires, prepped the kit, and when I was about to install everything, I put a deposit down on my 1M and halted the project. I did end up selling the kit to another member who got it working and posted his results.
Read carefully and thoroughly through the following thread from beginning to end, and you will have a good idea of what it takes. Parts will not cost you more than ~$100, and then whatever it costs to code bluetooth/GSM into the car's radio. Enjoy
http://www.e90post.com/forums/showth...tooth+retrofit