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Group GT3, technically known as Cup Grand Touring Cars and commonly referred to simply as GT3, is a set of regulations enforced by the Fédération Internationale de l'Automobile (FIA) for Grand Tourer racing cars designed for use in various car races series around the world. The GT3 category was originally created in 2005 by the SRO Group as a third rung in the Grand Touring motorsport ladder, below the Group GT1 and Group GT2 categories used in the SRO's FIA GT Championship, and launched its own series in 2006 called the FIA ​​GT3 European Championship. Since then, Group GT3 has become the de facto category for many national and international Grand Touring series, although some series change the ruleset from the FIA ​​standard. In 2013, nearly 20 automakers built or represented GT3 machines. Group GT3 allows homologation of a wide variety of car types with almost no limit on engine sizes and configurations or chassis construction or layout. GT3 cars must be based on mass production car models built and sold at the time of homologation. The performance of all Group GT3 cars is regulated, either by the FIA's GT office or by a specific series governing body, through Balance of Performance formulas that set the limits for horsepower, weight, engine management and aerodynamics. adjust to prevent a single manufacturer from becoming dominant in the class. The cars in GT3 are designed for a weight between 1200 kg and 1300 kg (2645 lbs and 2866 lbs) with horsepower between 500 hp and 600 hp. All cars have a very similar power-to-weight ratio, but are achieved by either high power and high weight, such as the Mercedes-Benz SLS AMG, or low power and low weight, such as the Porsche 911 GT3. GT3 cars also have traction control, ABS and built-in air connections for quick pit stops.