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BMW has officially unveiled the 6-Series Gran Coupe.

Designed to battle the Mercedes CLS, the sedan measures 4.4 inches (111 mm) longer than the 6-Series Coupe. The exterior styling is instantly recognizable but highlights include xenon headlights and 18-inch alloy wheels.

Inside, the cabin is luxuriously appointed with Dakota leather, heated front seats and dual-zone automatic climate control. There's also a "4+1" seating arrangement and a boot that holds 460 liters (16.2 cubic feet) of luggage. Options include ceramic accents, GPS navigation and a Bang & Olufsen audio system.

Under the hood, three engines are available. The 640i has a turbocharged 3.0-liter inline-six with 320 PS (235 kW / 315 hp) and 450 Nm (332 lb-ft) of torque. It enables the car to accelerate from 0-100 km/h in 5.4 seconds and hit a top speed of 250 km/h (155 mph).

The 650i uses a twin-turbo 4.4-liter V8 with 450 PS (330 kW / 443 hp) and 650 Nm (479 lb-ft) of torque. This allows the car to run from 0-100 km/h in 4.6 seconds, before topping out at 250 km/h (155 mph).

Lastly, the 640d has a 3.0-liter diesel engine with 313 PS (230 kW / 309 hp) and 630 Nm (465 lb-ft) of torque. Despite having the least powerful engine in the lineup, the car offers respectable performance as the dash to 100 km/h takes 5.4 seconds and the top speed is 250 km/h (155 mph).

Regardless of what engine is selected, it is connected to an eight-speed automatic transmission. Rear-wheel drive is standard, but all-wheel drive is optional on the 650i.

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