Aftermarket Bluetooth kit
 

I've tried looking, but can't seem to find much info anywhere on how to fit an aftermarket Bluetooth kit to an E53 X5 with Nav and DSP.

Anyone point me in the right direction? I'm thinking of maybe a Parrot MKi9100.

:dunno:

Check this out. E46 and E53 systems use the same components.

The only thing is that your tuner will be in the luggage compartment because you have nav. If you want a display up front and the mute kit must be in back, you need to do some extending of the wiring.