The BMW 6 Series is back unchanged for 2017. It comes in three styles: coupe, cabriolet and, for several years now, Gran Coupé sedan. Although the M6—a 560-hp beast—sits atop the food chain, the other variants aren't exactly slouches either. The 315-horsepower, base 640i version is surpassed by the 445-horsepower 650i. As you’d suspect, the prices are, like the cars themselves, powerful!