Power for the 2012 Porsche 911 Carrera Cabriolet comes from a new 3.4 liter boxer 6-cylinder making 350-hp. Mated to a Porsche’s PDK 7-speed dual-clutch transmission, the 911 Carrera Cabriolet goes from 0 to 60 mph in 4.4 seconds with a top speed of 177 mph.