I curently have a 2005 e53 X5 vin LV19655.

based on the information that I have it has the "640 CAR TELEPHONE PREPARATION" kit witch I assume every X5 have.

How hard is it to retrofit the Bluetooth kit ? I was considering ordering the kit from EAS but if it is too hard or if I need all bunch of wiring, I might just buy an external Bluetooth interface like the Clarion one.

Any help / feedback would be greatly appreciated.