The Porsche 911 GT3 is a higher performance version of the Porsche 911 sports car. It is the latest in a line of high performance models, beginning with the 1973 911 RS. The GT3, named after the Fédération Internationale de l'Automobile (FIA) GT class it was designed to compete in, has a 3.6 litre naturally aspirated six-cylinder engine, based on the unit used in the Porsche 962 and Porsche 911 GT1 race cars.
A number of variations, designed for road and track duty, have been introduced since its launch in 1999. The current range (997) includes three road and several racing models which listed below.
The GT3 has had a successful racing career in the one make national Porsche Carrera Cup series, and the international Porsche Supercup. It has won championship and endurance races, including the GT class of the American Le Mans Series seven times, first overall in the 24 Hours of Daytona, and first overall at the 24 Hours Nürburgring six times.