The front of the Xdrive spring/strut difference lies in the strut housing itself. The bottom spring perch on the xdrive is 12-15mm above what a normal RWD model would be.
So, while a sport spring in the front would normally lower a rwd vehicle 15-20mm. If you match correct weight springs your drop will only be about 5mm in the front if you switch from non sport to sport springs.
Hope this helps.
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