The Porsche 911 (pronounced as Nine Eleven or German: Neunelfer) is the flagship of the current line up of Porsche. It is a two-door grand tourer made by Porsche AG of Stuttgart, Germany. It has a distinctive design, rear-engined and with independent rear suspension, an evolution of the swing axle on the Porsche 356. Since its introduction in 1963,  it has undergone continuous development, though the basic concept has remained little changed.  The engine was air-cooled until the introduction of the Type 996 in 1998.
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Throughout its lifetime, 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 ever. In the mid-1970s, naturally aspirated 911 Carrera RSRs won major world championship sports car races such as Targa Florio, Daytona, Sebring and Nürburgring, even against prototypes. The 911-derived 935 turbo also won the coveted 24 Hours of Le Mans in 1979.