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The 996 GT3 R was a one-year-only (2000 model year) special of which only 63 were produced. The car took the basic GT3 bones and amplified it for motorsport. The Mezger engine produced over 400 horsepower, while factory-fitted adjustable shock absorbers gave better handling. Most notably, the GT3 R wore carbon-fiber bodywork meant for ultimate light weight in motorsport. The 996 GT3 R was introduced in 1999 as a replacement for the 993 RSR. Before its introduction, it was extensively tested at Weissach and Paul Ricard. In the 2000 FIA GT Championship, the 996 GT3 R was in the N-GT class and won every run. Won the 24-hour race at the Nürburgring. 
Following the Porsche 911 GT3 Cup, Porsche AG, Stuttgart, is entering yet another racing car in the 2010 motorsport season: The 911 GT3 R will be raced in series based on the international FIA GT3 regulations, thus succeeding the 911 GT3 Cup S. The main focus in developing this new model was on even better drivability and even easier handling. The 911 GT3 R is powered by a four-litre six-cylinder boxer engine delivering maximum output of 480 bhp (353 kW) transmitted to the rear axle by a sequential six-speed dog gearbox.
During the Geneva Motor Show, a Porsche 911 GT3 R with innovative hybrid drive is making its debut. The innovative hybrid technology featured in the car has been developed especially for racing, standing out significantly in its configuration and components from conventional hybrid systems. In this case, electrical front axle drive with two electric motors developing 60 kW each supplements the 480-bhp four-litre flat-six at the rear of the 911 GT3 R Hybrid. Instead of batteries, an electrical flywheel power generator delivers energy to the electric motors.
Porsche 911 GT3 R Hybrid 2.0 (2011)
The Porsche 997 GT3 R Hybrid 2.0 is an update to the 997 GT3 R Hybrid. Compared to its predecessor, which debuted in 2010, the 2011 second-generation hybrid is 20 percent lighter and more efficient without any concession to lap times. While sharing the same paint scheme, the new vehicle is easily identified by its lack of intakes in front of each rear wheel - changes to engine cooling allowed the slats to be dropped and aerodynamic efficiency improved. It gets a traditional race-bred flat six engine. The GT3 R Hybrid has a completely independent second driveline in the front of the chassis, a clever and complex hybrid electric set up that rockets it from standstill to 60 mph in just 2.5 seconds.
Based on the 911 GT3 RS production sports car, Porsche has designed a customer sport race car for GT3 series around the world: The 911 GT3 R. In developing the more than 368 kW (500 hp) racing nine-eleven, special attention was paid to lightweight design, better aerodynamic efficiency, reducing consumption, improved handling and optimised safety. The 911 GT3 R features the distinctive double-bubble roof, and the wheelbase which had been lengthened compared to the prior generation.
The GT3 R has always been placed between the GT3 Cup and the very expensive RSR. All the 991.2 racing cars have normally aspirated 4-litre engines. Compared to the 991.1 GT3 R, the 991.2 GT3 R engine offers a broader usable rev range and the engine response is more precise due to 6 throttle butterflies. The roof, front hood and fairing, wheel arches, doors, side and tail sections, rear lid and interior trim are made of carbon-fibre reinforced plastic. Gets new double wishbone suspension.