The key to improving X5 handling is lowering the center of gravity, increasing width of the stance, heavier sway bars and a strut tower brace. The goal being to reduce understeer. Just lowering, regardless of how you get there, will not be a dramatic improvement in handling.

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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas