YazX5
To answer your questions:
1. I can’t guarantee, but every e53 that I look at comes pre-wired for “Servotronic” .The plug is wire tied to the left strut tower.
2. I coded GM3 module with NcsExpert. Enable option 216A. I am not sure how to do it with your scanner, but I think it is possible. Use same technique as with most other modules.
3. Please note that I did not modify vehicle order file – it means that if car is coded with the data associated with your VIN – You will have to code Servotronic again. So, if you are planning to code other modules on your car with tool such as “Progman” - remember to recode GM3 to re-enable Servotronic. Alternatively, do it right the first time and update vehicle order information. In my case, I did not bother. If you do not plan to code the entire car with the “Progman” tool, than it is no issue.
4. I used “A1 Cardone” rebuilt racks and ZF servotronic converter valves on both cars. Looks like FCPeuro offers ZF rebuilt rack with converter attached – just verify with them to be sure. https://www.fcpeuro.com/products/bmw...x5-32136769268
5. If you choose, aftermarket rebuilds option – those come without converter. You can get it here: https://www.fcpeuro.com/products/bmw...em-32106767408
6. The Cardone rack which I use on both cars - Part Number: 26-2818. No issues for over 60k miles, but I think ZF is the better route, especially if it comes with valve pre-installed.

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2012 X5 x35i My new toy
2005 X5 4.4 Her's (Retrofitted Servotronic Steering Rack)
2003 X5 3.0 Mine (Retrofitted Servotronic Steering Rack and Heated Steering Wheel)
2001 M5 Son's car
2000 540i 6sp Sports pkg, supercharged. Son's car (Sold)
2001 530i (Sold)
1999 528i (Sold)
1975 2002 (Sold)