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Mercedes has the CLS, Volkswagen has the CC, Porsche has the Panamera and Audi has the A7. Now, BMW has joined the four-door coupe craze with the 2013 BMW 6 Series Gran Coupe by adding a rear bench and two additional doors. Compared to its two-door counterpart, the Gran Coupe is 4.4 inches longer. Like the rest of the 6 Series range, the Gran Coupe is based on the same platform as the brand