The Porsche 911 comes as either a coupe or a cabriolet in either a rear-wheel drive (C2) or an all-wheel drive (C4) configuration and each 911 comes as either a Carrera or the performance variant Carrera S. The 911 Carrera C2 and C4's are powered by a 345-hp 3.6-liter flat six-cylinder engine and the 911 Carrera C2S and C4S's are powered by a 385-hp 3.8-liter flat six-cylinder engine. The 911 Turbo models come with a 480-hp twin-turbocharged 3.6-liter flat six-cylinder engine. Each 911 engine is either mated to a six-speed manual or a seven-speed dual-clutch transmission known as PDK. The Targa, with its innovative glass-paneled roof has the same powertrains as the Carrera C4 and C4S models. The track derived GT3 is powered by a 415-hp 3.6-liter flat six-cylinder engine and comes exclusively as a rear-wheel drive coupe with a six-speed manual transmission. For 2009, the 911 Carrera's have revised styling including LED rear lighting, increased engine power and efficiency thanks to direct-injection, and now offer an optional seven-speed dual-clutch transmission (PDK) in place of the previous five-speed automatic.