I have active steering on my E60 and certainly wish it was on the X. I think it is definetely worth paying for since the X can sometimes be a pain in the royal bum to move around in tight spaces.

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-2006 E53 (X5 4.4) Titanium Silver, fully optioned (sports package, premium package, navigation, ride height adjustment, panorama moon roof, rear climate package). Aero kit installed plus set of staggered 20s with Diamaris tyres.