Short story---there have been many many threads about how to lower the riding height of a 4 bag system. The recalibration is done using the INPA/DIS software. If I recall correctly the drop can be as much as 1.5in. There have been no complaints about changes in handling or ride.

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