Originally Posted by Kiernan
6NS is a new option that has been introduced along with the new navigation system that wil be on all cars built from April. Not sure what it does, but I'd guess it will be the same as the F30/31 as they will all share the same navigation. There was a thread in the BMW forum on Pistonheads about it if you're interested (the title was something about deleting sport suspension on an F25 X3 Msport).
Hope this helps.
Thank you, i found the post you referenced - great forum and a very informative thread.