The engine has the same basic dimensions as the Cayenne Turbo, a 4.0-liter twin-turbo V8, but it has a new crankshaft, pistons, connecting rods, timing chain and torsional dampers. The eight-speed automatic will offer quicker shifts, says Porsche, while the Porsche Traction Management system has been fitted with a water-cooled transfer case, which further increases the thermal capacity of the drivetrain under high loads. A titanium sport exhaust comes standard saving 40 pounds, but the tailpipes still exit from the center. A new color called Arctic Gray debuts on the Turbo GT. It also gets a ...