Porsche's unveiling of the 2009 911 Carrera also came with the introduction of the new PDK seven-speed twin-clutch gearbox. It can shift 60-percent faster than the Tiptronic system, and reportedly helps the 911 S lap the Nurburgring eight seconds faster than the six-speed variant. Porsche has released a video explaining more about how the PDK works, showing off the dual wet clutches that are simultaneously connected to two gears so that when gear is engaged the next gear has been selected, essentially providing instantaneous shifts. Follow the jump to watch the PDK gear box in action and learn more about how the dual clutch system works.