The Porsche 911 lineup starts with the Carrera, powered by a 3.6-liter version of Porsche's classic flat six-cylinder engine generating 325 horsepower. The Carrera S and Carrera S Cabriolet are powered by a 3.8-liter six-cylinder, delivering 355 horsepower. The Carrera 4 is equipped similarly to the standard rear-drive Carrera, but with the added advantage of all-wheel drive. The same idea holds for the Carrera 4S, Carrera 4 Cabriolet, and Carrera 4S Cabriolet. The all-wheel drive 911 Turbo gets a twin-turbocharged 480 hp six-cylinder engine. The Turbo S Cabriolet features a power-operated convertible top. The GT3 is the track model. Its high-revving six-cylinder engine produces 415 hp. The 911 GT3 is available exclusively as a rear-wheel-drive coupe with a six-speed manual transmission. The new RS is essentially a 911 GT3 modified for even higher track performance. The Targa comes with all-wheel drive and the panoramic moonroof. It is mechanically identical to the Carrera 4. For 2007, the Porsche 911 gets a slew of new models and the Turbo S gets dropped from the lineup.