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The Porsche 911 991 is an entirely new platform, only the third platform since the original 911. Porsche revealed basic information on the Porsche 911 991 Carrera and Carrera S on 23 August 2011.[32] The Porsche 911 Carrera is powered by a 350 hp (257 kW) 3.4-liter engine. The Porsche 911 Carrera S features a 3.8-liter engine producing 400 hp (294 kW). A Porsche 911 Power Kit (option X51) is available for the Porsche 911 Carrera S, increasing power to 430 hp. The new Porsche 911's overall length grows by 2.2 inches and wheelbase grows by 3.9 inches (now 96.5 in.) Porsche 911 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 Porsche 911 Carrera S). The Porsche 911 design team was headed by Michael Mauer.

At the front, the new Porsche 911 991 has very wide-set headlights that are more three-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 Porsche 911 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 Porsche 911 interior is the center console, inspired by the Porsche Carrera GT and adopted by the Porsche Panamera.

The Porsche 911 991 is the first 911 to use predominantly aluminum construction. This means that even though the Porsche 911 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 Porsche 911 Carrera and Porsche 911 Carrera S are appreciably faster than the outgoing models. The Porsche 911 0--60 mph time for the manual transmission cars are 4.6 seconds for the Porsche 911 Carrera and 4.3 seconds for the Porsche 911 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 Porsche 911 optional sports chrono package, available in cars with the PDK transmission, the Porsche 911 991 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 Porsche 911 991 is also equipped with an industry-first 7-speed manual transmission with rev-matching. A new feature with the manual transmission is that it blips the throttle during downshifts (if in Sport Plus mode). Also, the 7th gear cannot be engaged unless the car is already in 5th or 6th gear.

In January 2013, Porsche introduced the all-wheel-drive variants of the Carrera models. The Porsche 911 '4' and 'Porsche 911 4S' models are distinguishable by wider tires, marginally wider rear body-work and a red-reflector strip that sits in between the tail-lights. In terms of technology, the new 4 and Porsche 911 4S models are equipped with an all-new all-wheel-drive system that sends power to the front wheels only when there is a need for it, giving the driver a sense of being in a rear-wheel-drive 911 when the conditions are perfect but sending power and torque to the front wheels only when the road and weather conditions are not ideal.

In May 2013, Porsche announced changes to the model year 2014 Porsche 911 Turbo and Porsche 911 Turbo S models, increasing their power to 520 hp on the 'Porsche 911 Turbo', and 560 hp on the 'Porsche 911 Turbo S', giving them a 0-60 mph time of 3.2 and 2.9 seconds, respectively. A rear-wheel steering system has also been incorporated on the Porsche 911 Turbo models that will turn the rear wheels in the opposite direction at low speeds or the same direction at high speeds to improve handling.[35]

In January 2014, Porsche introduced the new model year 2015 Porsche 911 Targa 4 and Porsche 911 Targa 4S models. These new Porsche 911 models come equipped with an all-new roof technology with the original Porsche 911 Targa design, now with an all electric cabriolet roof along with the B-pillar and the glass 'dome' at the rear. http://en.wikipedia.org/wiki/Porsche_911 Porsche 911 wiki