That's gonna be more money and trouble than it's worth. I'm guessing in the thousands since you have a bunch of antennae and wiring and control modules plus programming and new key fobs. Like some other options (like HID lights), the cheapest way would probably be to trade it on one that has it already
A forum community dedicated to BMW owners and enthusiasts. Come join the discussion about Bimmerfest events, production numbers, programming, performance, modifications, classifieds, troubleshooting, maintenance, and more! Bringing the BMW community together.