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, introduced in 1999, 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 cars have been produced.
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 Championship. 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.
Porsche launched the RS version of the 911 GT3 at the Geneva Motor Show in 2015. Compared to the 911 GT3, the front fenders are now equipped with louvers above the wheels and the rear fenders now include Turbo-like intakes, rather than an intake below the rear wing. The roof is made from magnesium. The interior includes full bucket seats (based on the carbon seats of the 918 Spyder), carbon-fibre inserts, lightweight door handles and the Club Sport Package as standard (a bolted-on roll cage behind the front seats, preparation for a battery master switch, and a six-point safety harness for the driver and fire extinguisher with mounting bracket).The car was nominated as one of the Britain's best driver's car 2014 by Autocar magazine.
The 3.8-litre unit found in the 911 GT3 is replaced with a 4.0-litre unit with 500 hp (370 kW) and 339 lb ft (460 N·m) of torque. The transmission is PDK only. The drivetrain delivers 0-62 mph (100 km/h) in 3.4 seconds (0.6 seconds quicker than the 997 GT3 RS 4.0) and 0-124 mph (200 km/h) in 10.9 seconds. The 991 GT3 RS also comes with functions such as declutching by "paddle neutral" — comparable to pressing the clutch with a conventional manual gearbox –- and Pit Speed limiter button. As with the 911 GT3, there is rear-axle steering and Porsche Torque Vectoring Plus with fully variable rear axle differential lock. The Nürburgring Nordschleife time is 7 minutes and 20 seconds
In February 2018, Porsche revealed a facelifted GT3 RS model to continue their updates for the 991 generation of the 911. Changes include a new engine similar to the GT3 and RSR models with a 9,000 rpm redline and 20 PS (15 kW; 20 bhp) and 10 N⋅m (7.4 lb⋅ft) increase over the previous GT3 RS, NACA ducts for brake cooling, modified front fascia (similar to the 991.2 GT3), side skits and rear wing (similar to the GT2 RS) for increased downforce, ball joints on all suspension links, front helper springs, lightweight glass for the rear and rear-side windows and a newly developed tyre compound. A Weissach package including additional carbon fibre body and interior parts as well as magnesium wheels and stiffer suspension settings is available as an option.
On 18 April 2018 the 991.2 GT3 RS set a lap time of 6:56.4 around the infamous Nürburgring Nordschleife race track. It is the third Porsche production car to break the 7 minute barrier around the track, the first being the 918 Spyder.