2015 BMW Alpina B6 Gran Coupe Challenges the M6 in New York

The US has received a handful of Alpina models through BMW factory channels, namely the 7-Series-based B7, and now we're getting another fast four-door with the debut of the BMW Alpina B6 xDrive Gran Coupe at today's 2014 New York Auto Show.

The B6 Gran Coupe stands as an interesting sibling to the factory's M6 Grand Coupe. Both are propelled by a 4.4-liter twin-turbo V8, but the tunes are quite different. The Alpina produces 540 horsepower and 540 pound-feet of torque, which is 20 hp less than the M6, but with 40 lb-ft more torque. An eight-speed automatic and all-wheel drive mean that the B6 is about half a second quicker to 100 km/h than BMW's own creation. Plus, the B6 has an unrestricted top speed of 318 km/h, making it one seriously rapid 6 Series Gran Coupe.

The sport sedan also wears other Alpina goodies like 20-inch versions of the brand's 21-spoke wheels and exclusive color options.