First off I would like to welcome you to the group. Depending on the VIN range of your M (some 2009 models apply) and symptoms you are experiencing your car may be eligible.
You mentioned a highway speed vibration? Could you please elaborate?
The steering rack update is for the resolution of one issue. The primary issue is the groan on turning some M35x and EX35 owners have been experiencing. There are no major report (to the best of my knowledge) of highway vibrations. That is not to say that there are not some owners that are experiencing leading on some highway surfaces. This is usually resolved with different tires, see the tire review thread.
Depending on the route your routinely drive an alignment and tire pressure check may be in order. If you are withing the initial 12mo/12k mi adjustments warranty there will be no charge for the alignment as part of your basic warranty.
I will respond to your thread in the M forum as I feel this is progressive to the ongoing discussion there. I apologize for the delayed response, to a direct thread title.
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