Others have followed, but the BMW X5 invented a class. As BMW's 3 Series defines the sport sedan, the X5 defines an expanding group of big, powerful SUVs that shine for their on-pavement agility and lightning acceleration, with an emphasis on luxury appointments. Climb out of a truck-based luxury SUV like the Cadillac Escalade, and the X5 feels as capable on the road as the big BMW 7 Series sedan (even though it isn't).

Improvements for 2004 are more extensive than any since the X5 was introduced five years ago. And a new high-performance 4.8is model has been added to the lineup.

Logic? You'll have to set it aside to appreciate the BMW X5. The X5 is 2.5 tons of speed, comfort and prestige. It's quicker away from traffic lights than most cars, and capable of nearly 150 mph, though we certainly don't recommend driving a vehicle this tall that fast. Its steering is precise and it's exceptionally stable at supra-legal speeds. Massive tires contribute to impressive cornering grip and stopping power. The X5 offers nearly all the bells, whistles and high-tech gizmos that you'll find on the most expensive sedans in the world. A big V8 delivers the ultimate X5 thrill, but it's also available with an outstanding six-cylinder.