Ive seen the work thats involved in a REtrofit and its not pretty!
However, these claim to be plug and play
http://www.motivemods.com/BMWRetrofi...-p/mm-pa-2.htm
so it seems like you dont have to wire up to your shiftier and remove half the cabin to get to it..
The guy told me it works on e84
Still need to spend up to a $1000 on a new steering wheel and sifter paddles..
This is on my list of to do's...
Let me know if anyone does it!
EDIT: $937 I priced up for everything on their website.. without shipping...
Not too bad!