The Porsche 911 Carrera 4S (997) is an all-wheel-drive variant of the Porsche 911 Carrera S (997). Porsche adjusted the system to transfer between 5 to 40 percent of the traction to the front wheels for better handling. Like the rear-wheel-drive variant, the Carrera 4S is also fitted with the PASM (Porsche Active Suspension Management), allowing the user to switch between a comfortable and sportier setting.