To make its big car go fast, BMW has stuffed a 4.4-liter twin-turbo V-8 under the hood, good for 523 horsepower and 553 lb-ft of torque. That's hooked up to an eight-speed auto and xDrive system that divvies power between the rear and front wheels, resulting in explosive acceleration off the line with little to no wheel-spin. Consistent, too, thanks to its launch control system, which is easy to activate. But perhaps most important to most buyers is the smooth, calm way it cruises the boulevard and highway; ride quality is remarkably good considering its sporty suspension (with adjustable dampers) and 20-inch-wheel setup (245/35 up front and 275/30 at the rear).

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