Porsche 911 GT3 is a high-performance homologation model of the Porsche 911 sports car. It is a line of high-performance models, which began with the 1973 911 Carrera RS. The GT3, introduced in 1999, is named after the Fédération Internationale de l'Automobile (FIA) Group GT3 class, in which its racing counterpart was designed to compete. The GT3 has had a successful racing career in the one-make national and regional Porsche Carrera Cup and GT3 Cup Challenge series, as well as the international Porsche Supercup supporting the FIA Formula 1 World

For 2010, the second generation 911 GT3 RS (known as 997.2 GT3 RS) received an additional 15 PS (11 kW; 15 hp) due to a new 3.8-litre flat-6 engine, bringing total power output up to 450 PS (331 kW; 444 hp). The car was not approved for competition in the United States by IMSA American LeMans. Grand-Am originally did not approve the car, but after performance issues (a Porsche team did not compete at the Indy Grand Prix of Alabama round), Grand-Am approved the second-generation car in April 2010. A number of variants, designed for road and track, have been produced since its inception in 1999. More than 14,000 911 GT3 cars have been produced.

. Porsche Carrera CupThe 911 GT3 RS 4.0, launched in 2011, was the final evolution of the 997 GT3 and featured a 4.0 litre flat-six engine (the largest engine offered in a street-legal 911). The engine itself uses the crankshaft from the RSR with increased stroke dimensions (from 76.4 mm to 80.4 mm). This change increased the power output to 500 PS (368 kW; 493 hp) at 8,250 rpm and 460 N⋅m (339 lbf⋅ft) of torque at 5,750 rpm. Chassis development was influenced by the GT2 RS and uses parts from other RS 911s. Front dive planes give additional downforce up front. The car weighs in at 1,360 kg (2,998 lb), giving it a power-to-weight ratio of 365 hp per ton. Only 600 cars were built. At 493 hp (368 kW), the engine is one of the most powerful six-cylinder naturally aspirated engines in any production car with a 123.25 hp (92 kW) per litre output. Performance figures include 0-97 km/h (60 mph) acceleration time of 3.5 seconds and a top speed of 311 km/h (193 mph).[27] The lap time on the Nürburgring Nordschleife is 7 minutes and 27 seconds

This is a fantastic example of Porsche's 911 GT3 RS from 2011. Sold to Denmark a couple of years ago.