The 540 HP BMW Alpina xDrive B6 Gran Coupe Is The Baddest Gran CoupePatrick George4/16/14 12:34pm303EditPromoteGo to permalinkI look around, I see lots of Gran Coupes these days. 4-Series. 6-Series. Heck, there's probably more in the pipeline. But which one is the baddest Gran Coupe of all? The Alpina xDrive B6 Gran Coupe, that's what. And it's here in the flesh at the New York Auto Show.