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 325 hp 3.6-liter flat six-cylinder engine and the 911 Carrera C2S and C4S's are powered by a 355 hp 3.8-liter flat six-cylinder engine with an option to upgrade the horsepower to 381. 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 five-speed automatic Tiptronic S transmission. The Targa, with its innovative glass-paneled roof has the same powertrains as the Carrera C4 and C4S models The track derived GT3 and GT3 RS are powered by a 415 hp 3.6-liter flat six-cylinder engine and come exclusively as rear-wheel drive coupes with a six-speed manual transmission. The Porsche 911 is a carryover from 2007.