I read one of your posts and it seems pretty simple. So basically all we would is a servotronic steering rack and the servotronic motor? And the after do the coding procedure to add that option to the car? If you could shed some light on this it would be great as I really wanna do this.

So here's the parts list I came up with :

For vehicles with
HYDRO STEERING-SERVOTRONIC
S216A=Yes
01 Rmfd hydro steering gear Servotronic ZF 1 10/2003
32136769268 $2020.75

And motor

For vehicles with
HYDRO STEERING-SERVOTRONIC
S216A=Yes
07 Torque converter servotronic ZF 1
32106788212

So if you could just confirm that that's all we would need that would be great. And oh also you said that it might be prewired, there's a connector by the left strut tower or something I believe?
And finally for the coding part what did you use, I have BMW scanner 1.4.0 but I'm unsure wether it could do the job or not.
Thanks in advance.