The Porsche 911 GT3 is a high performance version of the Porsche 911 sports car. It is the latest in a long line of high performance models, beginning with the 1973 911 RS. The GT3, named after the FIA GT class for which it was intended, 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 both road and track, have been added to the range since its launch in 1999. The current range (997) includes two road and three racing models. In addition to this, Porsche is currently developing a hybrid version that uses two electric motors and a kinetic energy recovery system, as initially developed for Formula One.