I thought the X5 sport option was just cosmetic. The suspension upgrade is called Adaptive Drive, and gets good reviews, but I can't imagine retrofitting it, with all the hydraulics.

Trade it. Or aftermarket suspension if you just want to make ride rougher.

__________________
2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue