There won't be an 528i anymore in modell year 2001. Instead of it they'll sell the 530i. The three liter benzin engine will start first in the X5 (or may be it's allready available in US?). The sport package is already available in Europe. To identify a car on the road if it's a real M5 or just an 5 series with the sport package I found only three ways: the M5 is the only one with the oval rear mirrors, is the only one with exaust ends on both sides on the rear and the M5 has an slightly different front spoiler. Hope that helps.