I have a 2006 e53, This weekend I am finishing my project of installing a BT system.

Next Navigation system, due to the crunch of the economy I am not able to purchase the whole system at once, I am gonna have to get it in pieces. So I have a few questions for you all...

1.) will the navi screen, antenna, and tuner work without a MK4? I was thinking of getting the hardware down and at least able to listen to radio. is this possible?

2.) how would you do this? I guess there is also an option of saving some money and getting this all at once, but hey... i am only human and can't wait. hahaha

Thank you in advance