The Porsche 911 (pronounced as nine eleven) is a sports car made by Porsche AG of Stuttgart, Germany. The famous, distinctive and durable car has undergone continuous development since its introduction in autumn 1963. Mechanically it is notable for being rear engined and, until the introduction of the all-new Type 996 in 1997, air-cooled.
Since its inception the 911 has been modified, both by private teams and the factory itself, for racing, rallying and other types of automotive competition. It is often cited as the most successful competition car ever, especially when its variations are included, mainly the powerful 935.