X5's front styling, transmissions, AWD system, and V8 engine are revised for 2004, and a high-performance model was added midyear. BMW's American-built SUV comes as the 225-hp 6-cyl 3.0i model and the V8 4.4i. The 4.4i now has 315 hp, up from 290. Last year's high-performance 4.6is model was discontinued, but a 4.8is replacement arrived in spring 2004. The 4.8is has a 355-hp 4.8-liter V8. X5s have all-wheel drive without low-range gearing, plus ABS, front torso side airbags, and front and rear head-protecting tubular side airbags. Rear torso side airbags are optional. The 3.0i replaces last year's 5-speed manual transmission with a 6 speed. Returning is the 3.0i's optional 5-speed automatic. The 4.4i comes only with automatic transmission and replaces a 5 speed with a new 6 speed. That automatic is also standard on the 4.8is. Automatics have a manual shift gate. X5's new AWD system continuously varies power front to rear to maximize traction. It replaces an AWD system with a fixed 38/62 power split. ABS and antiskid/traction control are standard on all X5s. The 3.0i comes with 17-inch wheels; 18s are available in its optional Sport Package. The 4.4i has standard 18s, with 19s available in tandem with its Sport Package. Both Sport Packages include firmer suspension tuning. The 4.8is comes with the Sport Package suspension and 20-inch wheels. Standard on V8s and optional on the 3.0i are automatic-leveling rear suspension, bi-xenon headlamps, and leather upholstery. Other options include a navigation system and an adjustable ride-height suspension.