BMW redesigns the larger of its two SUVs for 2007, making it bigger and offering seven-passenger seating. Compared to the 2000-2006 models, the 2007 X5 is 4.5 inches longer in wheelbase, 7.4 inches longer overall, 2.4 inches wider, and 2 inches taller. It is offered in two models. The 3.0si has a 260-hp 6-cyl engine and replaces the 225-hp 3.0i. The 4.8i has a 350-hp 4.8-liter V8 and replaces the 315-hp 4.4i. Both come only with a 6-speed automatic transmission. Standard seating is for five, but an optional 3rd row expands capacity to seven. All X5s have all-wheel drive without low-range gearing, traction/antiskid control with rollover sensors, and hill descent control. Front side airbags are standard, as are curtain side airbags that cover the first two seating rows and include rollover deployment. All X5s have steering-linked xenon headlights and BMW's iDrive that uses a single knob to control entertainment, communication, navigation, and climate functions. An available sport package includes driver-adjustable suspension and BMW's Active Roll Stabilization that counters body lean. BMW's Active Steering, designed to quicken low-speed steering response, is optional. Other options include a navigation system, head-up instrument display, DVD entertainment, rearview camera with front/rear obstacle detection, and BMW Assist concierge service with wireless cell phone link.