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The Porsche 991 was titled World Performance Car 2012[10] shortly after famed Porsche designer Ferdinand Alexander Porsche died.
The 991 is an entirely new platform, only the third platform since the original 911. Porsche revealed basic information on the 991 Carrera and Carrera S on 23 August 2011.[32] The Carrera is powered by a 350 hp (257 kW) 3.4-liter engine. The Carrera S features a 3.8-liter engine producing 400 hp (294 kW). A Power Kit (option X51) is available for the Carrera S, increasing power to 430 hp. The new 991's overall length grows by 2.2 inches and wheelbase grows by 3.9 inches (now 96.5 in.) Overhangs are trimmed and the rear axle moves rearward roughly 3 in. toward the engine (made possible by new 3-shaft transmissions whose output flanges are moved closer to the engine). There is a wider front track (2.0 inches wider for the Carrera S). The design team was headed by Michael Mauer.

At the front, the new 991 has very wide-set headlights that are more 3-dimensional. Front fender peaks are a bit more prominent, and wedgy directionals now appear to float above the intakes for the twin coolant radiators. The stretched rear 3/4 view has changed the most, with a slightly more voluminous form and thin taillight slivers capped with the protruding lip of the bodywork.The biggest and main change in the interior is the center console, inspired by the Carrera GT and adopted by the Panamera.

The 991 is the first 911 to use predominantly aluminum construction. This means that even though the car is larger than the outgoing model, it is still up to 50 kilograms (110 lb) lighter. The reduced weight and increased power means that both the Carrera and Carrera S are appreciably faster than the outgoing models. The 0--60 mph time for the manual transmission cars are 4.6 seconds for the Carrera and 4.3 seconds for the Carrera S. When equipped with PDK the 991 models can accelerate from 0--60 mph in 4.4 seconds and 4.1 seconds for the Carrera and Carrera S respectively. With the optional sports chrono package, available in cars with the PDK transmission, the 991 Carrera can accelerate from 0--60 mph in as little as 4.2 seconds [33] and the Carrera S can do the same in 3.9 seconds.[34]

Apart from the reworked PDK transmission, the new 991 is also equipped with an industry-first 7-speed Manual-Transmission with rev-matching. A new feature with the new manual-transmission is that it blips the throttle during downshifts (in Sport Plus mode). Also, the 7th cog cannot be engaged unless the car is in 5th or 6th gear.
In 1974 Porsche introduced the first production turbocharged 911. Although called simply Porsche 911 Turbo in Europe, it was marketed as Porsche 930 (930 being its internal type number) in North America. The body shape is distinctive thanks to wide wheel-arches to accommodate the wide tires, and a large rear spoiler often known as a "whale tail" on the early cars, and "tea-tray" on the later ones. Starting out with a 3.0 L engine 260 PS (190 kW; 260 hp), these early cars are known for their exhilarating acceleration coupled with challenging handling characteristics and extreme turbo lag. For 1978, capacity rose to 3.3 L 300 PS (220 kW; 300 hp), and an intercooler was added which was placed under the rear spoiler.

Production figures of the basic 930 soon qualified it for FIA Group 4 competition, with the racing version called the Porsche 934 of 1976. Many participated at Le Mans and other races including some epic battles with the BMW 3.0 CSL "Batmobile". The wilder FIA Group 5 version called Porsche 935 evolved from the 2.1 L RSR Turbo of 1974. Fitted with a slope nose, the 500+ PS car was campaigned in 1976 by the factory, winning the world championship title. Private teams went on to win many races, like Le Mans in 1979, and continued to compete successfully with the car well into the 1980s until the FIA and IMSA rules were changed.

Only in 1989, its last year of production, was the 930 equipped with a five-speed gearbox. The 930 was replaced in 1990 with a 964 version featuring the same 3.3 L engine. There have been turbocharged variants of each subsequent generation of 911.
http://en.wikipedia.org/wiki/Porsche_991