There’s no denying that even straight off the showroom floor, the new-for-2012 Mercedes-Benz CLS—the automaker’s supremely stylish “four-door coupe”—is a prodigious performer. The 402 hp CLS550 will sprint to 60 mph in a spirited 5.1 seconds, and the beastly CLS63 AMG, with its 518 hp twin-turbo V-8, will make the ...
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