The Porsche 911 GT3 is a high performance version of the Porsche 911 sports car primarily intended for racing. It is a line of high-performance models, which began with the 1973 911 Carrera RS. The GT3 is named after the Fédération Internationale de l'Automobile (FIA) Group GT3 class in which it was designed to compete. A number of variations, designed for road and track duty, have been introduced since its launch in 1999. More than 14, 000 911 GT3 cars have been produced. 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. The "GT3" nameplate was introduced in 1999 as part of the first generation of the Porsche 996 model range (commonly known as 996.. As with Porsche's previous 911 RS models, the 996 GT3 was focused on racing, and so was devoid of items that added unnecessary weight to the car. Sound deadening was almost completely removed, as were the rear seats, rear loud speakers, sunroof, and air conditioning, although automatic air conditioning and CD/radio became no-cost optional add-ons. The engine of the 996 GT3 set it apart from most of the other Porsche 996 models, although it shared the same basic design of the standard so-called "integrated dry sump" flat-six engine. The engine is naturally aspirated and based on the unit used in the Porsche 962 and Porsche 911 GT1 race cars. That engine was known as the 'Mezger' engine, after its designer Hans Mezger. The engine uses the original air-cooled 911's versatile dry-sump crankcase, with an external oil reservoir. The 996 GT3 has 360 PS (265 kW; 355 hp), compared to the 300 PS (221 kW; 296 hp) of the regular Porsche 996. In GT3 configuration, this so-called "split" crankcase (meaning the parting line of crankcase
