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If you're talking about the ability to lower the top using the key fob, there is no retrofit. It just needs to be activated by the dealer. I had mine activated about 6 months after I bought the car because I didn't know about it when I bought the car.
No, I am talking about having the key in your pocket and it unlocks the doors when you are close. And then allows you to hit the start button (MINI has a retrofit kit for the start button already) to start the car without ever removing the key from you pocket (i may have this part wrong).