It's just that the fender flares can't be ordered with your dealer unless you get the sport option on a 4.8i. What a lot of people do on their own is order the flares and put them on on their own, it'll fit just fine on a 3.0si too.

http://www.xoutpost.com/accessories-f...el-option.html (you may want to ask for updated pricing in case and don't forget the rivets)

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'08 X5 3.0si - Alpine White / Saddle Brown interior
Specs: Sport Pkg, Premium Pkg, Tech Pkg, Comfort Access, Aero Kit, Style 433 staggered 20s on Conti DWS
Mods: Carbon 35 tint, LED angel eyes, GP Thunder 7500k fogs, H&R 20mm/25mm spacers, clear reflectors, gunsmoke-tinted taillights
Coded: Digital speedo, windows/sunroof/tailgate close via keyfob

X5 pics at Flickr