The 911 is available as either a coupe or a cabriolet, in either a rear-wheel drive (Carrera) or an all-wheel drive (Carrera 4) configuration, as well as a Turbo all-wheel drive model. The 911 Carrera and Carrera 4 are powered by a 345-hp direct-injection 3.6-liter flat six-cylinder, and the Carrera S and Carrera 4S's are powered by a 385-hp direct-injection 3.8-liter flat six-cylinder engine. The Turbo is a 500-hp version of the 3.8-liter (530-hp in the Turbo S). Transmission choices are a six-speed manual or seven-speed dual-clutch known as PDK. The track-derived GT3 is powered by a 435-hp 3.8-liter flat six-cylinder engine and comes exclusively as a rear-wheel drive coupe with a six-speed manual transmission. For 2011, the Turbo gets it's own S model that is standard with PDK and ceramic brakes, and the GT3 adds an even more hardcore RS version with 450-hp. For the truly power hungry, the GT2 returns as an RS with a 620-hp twin-turbo 3.6-liter.