BMW is on their 4th revision of the steering rack for the F30. 3rd revision was used through end October 2012 builds. 4th revision is in cars from November 2012 and the part list indicates it ends with the completion of MY13 builds. Its anyone's guess what comes beginning MY14 (July production).
I'm wondering if they are changing steering rack vendors for MY14 cars (F10, F30, etc.). The current cars rack is manufactured by Thyssen Krupp.
http://www.realoem.com/bmw/showparts...71&hg=32&fg=12
So far my November build MSport with DHP (adaptive M and VSS) has no steering shake/wobble. I'll agree the F30 steering feel is too light in Eco Pro and Comfort modes but tightens up nicely in Sport mode. It feels just right in Sport. Still not as tight as an E90 or later years E46, but I say "just right" because the F30 is definitely more of a grown up 3 series. More than just evolving from the E chassis numbers, the F30 feels "mature" if that makes sense.