The 520-horsepower 2006 Porsche Cayenne Turbo S barely wavered at three times the speed of sanity. There was a little vibration, but nothing more than you’d get on slightly rough pavement, and none of the lightness and lift that usually comes with high speed. No wonder, though, because the Cayenne Turbo S weighs 5,875 pounds fully loaded with options. That’s 2,200 lbs. more than a 911 Carrera S. You’d need a jet engine to raise the wheels of the Cayenne Turbo S off the pavement.