Hello,
I've a 2008 BMW X3 and I know that it is pre-wired for blue tooth and satlite radio. I am about to install a factory navigation retrofit into my x3. Please kindly help me with these questions,
1- Can I use the existing antena for navigation retrofit or do I have to use the one I got with the navigation kit?
2-Could anyone take a look at the attached pictures and tell me what these plugs are for?

Thanks in Advance,

Attached Images