Not sure from your options list, did you get adaptive drive or active steering? either one of those would be a great add (not cheap though). I am really liking adaptive drive on mine. Steering is heavier than I'm used to (my first BMW) and active steering might have given me more for the effort, but I'll live :-)

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In My Garage: 2011 X5 5.0i, Carbon Black/Black Nevada
ZAV ZCW ZMP ZPP ZPS ZTP 322 4BP 456 5AC 6NF