It may be a frigid 10 degrees Farenheit in Detroit, but BMW has just unveiled 2011 6-Series Cabrio at the North American International Auto Show.

Drawing inspiration from the Concept 6-Series Coupe, the convertible measures 4,894mm long, 1,894mm wide, and 1,365 mm tall. It retains the iconic double-buttress roof but gains a protruding twin-kidney grille, xenon headlights, LED fog lights and 18-inch alloy wheels (19-inchers on the 650i).

Inside, the open-air luxury machine boasts Dakota leather upholstery, a freestanding 10.2-inch iDrive display, GPS navigation, and the usual wood / metallic trim.

When the car is launched in March, two engines will be available. The 640i uses a turbocharged 3.0-liter inline six-cylinder that produces 320 hp (239 kW / 324 PS) and 450 Nm (332 lb-ft) of torque. It enables the car to accelerate from 0-100 km/h in 5.7 seconds, before hitting an electronically limited top speed of 155 mph (250 km/h). In terms of efficiency, expect 35.8 mpg (imp) in the combined cycle and CO2 emissions of 185 g/km.

If that isn't powerful enough, the 650i features a twin-turbo 4.4-liter V8 engine with 407 hp (304 kW / 413 PS) and 600 Nm (442 lb-ft) of torque. Thanks to this beefy powerplant, the drop top accelerates from 0-100 km/h in 5.0 seconds and has an electronically limited top speed of 155 mph (250 km/h). While owners likely won't care about the car's fuel economy, expect to average a combined 26.4 mpg (imp) while emitting 249 grams of CO2 per kilometer.

Gallery: 2011 BMW 6-Series Cabrio drops its top in the Motor City

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