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We think the "M" in M6 stands for more; here, BMW's four-door coupe comes in a performance version with a sport-tuned chassis and a 560-hp twin-turbo V-8. Torque peaks at 500 lb-ft; you have your choice of either a seven-speed dual-clutch automatic or—for the true enthusiast—a six-speed manual. The manual matches revs on downshifts for added fun. While the sheetmetal is gorgeous and the interior luxurious, the back seat is too cramped for adults to ride comfortably, if at all.