I have had very elaborate aftermarket navi/sound systems in some of my previous vehicles. In my personal opinion, this is not the vehicle to do this in. The stock Navi and Premium sound is more than adequate. If you want to spice up the audio setup, it can be done very simply by adding a small sub, or replacing the stock speakers. I like this vehicle way too much to go hacking it up, even though my Audio guy works on Bentleys Lambo's etc.

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2013 X5 Xdrive35i Premium
2013 F30 328i
2004 Mustang GT Very Modded...