We spent 90 minutes plowing over the dunes in the 2006 Porsche Cayenne Turbo S. Dubai’s sand is fine like talc and it feels much like driving on powdered snow over packed ice. Nevertheless, the Cayenne Turbo S was totally in its element and, with an experienced driver behind the wheel, totally in command of the desert. It was amazing to consider that this was the same vehicle that, minutes before, was comfortably blazing along the blacktop at 168 mph.