here is the update
1. went to a workshop to do inspection and tighten suspension, top mount, etc and test drive the car left/right/center. found no feasible wear&tear or mis-installation. steering still got ngeet ngeet sound on low speed turning (right only)
2. sent the car to pml for checking. pml advise to "lubricate" the steering rack and update software. 2 days downtime and the problem is resolved. ask the SA what is the cause, he cannot be certain whether is the lubrication or re-programming resolve it. anyway, very happy with the end result. after software update, the steering is heavier (in comfort mode) and more crispy - as explained in f10 lci that light steering feel is eliminated. now i can aw corner with +1bhp
3. went to dr max to re-code all my favorites as pml re-programming wipe out everything back to stock. after several attempts find out the Internet Browser, BMW Live and TMC Traffic does not work with the new software according to max the integration level dated nov-13. gotta wait for dr max new medicine after xmas
ho ho ho ... huat ah!