The Porsche 911 (pronounced Nine Eleven or in German: Neunelfer) is a two-door, 2+2 high performance rear-engine sports car.
Introduced in September 1964 by Porsche AG of Stuttgart, Germany. It has a rear-mounted flat-six engine and all round independent suspension. It has undergone continuous development, though the basic concept has remained unchanged.

The engines were air-cooled until the introduction of the Type 996 in 1998, with the 993, produced from 1994–1998 model years, being the last of the air-cooled Porsche sports cars.

The 911 has been modified by private teams and by the factory itself for racing, rallying, and other forms of automotive competition. It is among the most successful competition cars. In the mid-1970s, the naturally aspirated 911 Carrera RSR won major world championship sports car races, such as Targa Florio and 24 Hours of Daytona, even against prototypes. The 911-derived 935 turbo also won the 24 Hours of Le Mans in 1979 and Porsche won World Championship for Makes titles in 1976, 1977, 1978 and 1979 with 911-derived models.
In the 1999 international poll to determine the Car of the Century, the 911 came fifth. It is one of two in the top five that had remained continuously in production (the original Beetle remained in production until 2003), and was until 1998 a successful surviving application of the air- (now water-) cooled opposed rear-engine layout pioneered by its ancestor, the Porsche 356. It is one of the oldest sports coupé nameplates still in production with one million manufactured as of May 2017.

Design

For the 2011 model year, Porsche introduced the first ever GTS model for the 911. Designed as a driver’s car, the GTS was more powerful than the S, better handling via a bespoke suspension design, and positioned as a more street friendly alternative to the GT3, Porsche's track-focused 911 variant. The GTS featured race-inspired centre lock wheels, unique styling including a Sport Design front bumper, special rear bumper, blackout trim, side skirts borrowed from the GT2 model, brushed stainless steel "Carrera GTS" door sills and Alcantara trim. Many GTS' were ordered with the Alcantara delete, instead being built with leather. The GTS was very rare in that it was a rear wheel drive Wide-Body design (44 mm wider than a standard 911), 20 mm lower and offered 408 HP (versus 385 HP for the S) like the similar, limited volume Sport Classic and the Speedster. Porsche built approximately 2,265 total GTS models for the world market, as well as a handful designated as 2012 models. The enthusiastic reception the GTS model received from both the motoring press and consumers, convinced Porsche to make the GTS a staple of the 911 line beginning in 2015, with the "type 991" 911 successor.

Mechanical

The 991 is the first 911 to use a predominantly aluminium 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 0–97 km/h (60 mph) acceleration time for the manual transmission cars are 4.6 seconds for the Carrera and 4.3 seconds for the Carrera S. When equipped with the PDK transmission, the two 991 models can accelerate from 0–97 km/h in 4.4 seconds and 4.1 seconds. With the optional sports chrono package, available for the cars with the PDK transmission, the 991 Carrera can accelerate from 0–97 km/h in as little as 4.2 seconds and the Carrera S can do the same in 3.9 seconds.

In September 2015, Porsche introduced the second generation of 991 Carrera models at the Frankfurt Motor Show. Both Carrera and Carrera S models break with previous tradition by featuring a 3.0-litre turbocharged 6-cylinder boxer engine, marking the first time that a forced induction engine has been fitted to the base models within the 911 range.

Awards

In 2015, Car and Driver named the Porsche 911 "the best premium sports car on the market"

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