Porsche purists may scream “blasphemy” when it comes to the 2013 Porsche Cayenne SUV, but there’s no denying that it’s been a major hit for the German manufacturer. In the United States, the Cayenne regularly out-sells all other models in the Porsche lineup, and its success has even spawned the creation of a smaller crossover vehicle, the Macan, due in 2013.