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The Porsche 911 GT3 RS 4.0 is the final evolution of the 997 and features a 4.0 litre engine. The engine itself uses the crankshaft from the RSR with increased stroke dimensions (from 76.4mm to 80.4mm). This change has increased the power to 368 kW (500 PS; 493 hp) at 8250 rpm and 460 N·m (339 lbf·ft) of torque at 5750 rpm. Chassis development has been influenced by the GT2 RS and uses bits from other RS 911s. Front dive planes give additional downforce up front. The car weighs in at 1,370 kilograms (3,000 lb), giving it a power-to-weight ratio of 365 bhp per ton. Only 600 cars will be built.[30]

Performance is a 3.9 second 0-100 kilometres per hour (62 mph) time and a top speed of 193 miles per hour (311 km/h). The Porsche 911 GT3 is a higher performance version of the Porsche 911 sports car. It is the latest in a line of high-performance models, beginning with the 1973 911 RS. The GT3, named after the Fédération Internationale de l'Automobile (FIA) GT class it was designed to compete in, has a 3.6-litre naturally aspirated six-cylinder engine, based on the unit used in the Porsche 962 and Porsche 911 GT1 race cars.

A number of variations, designed for road and track duty, have been introduced since its launch in 1999. The current range (997) includes three road and several racing models which are listed below.

The Porsche 911 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 new Porsche 911 997 GT3 R Hybrid made its debut at the 2010 Geneva Motor Show. The hybrid technology featured in the car was developed by the Williams F1 Team and is based on their F1 kinetic energy recovery system (KERS) which they did not race in 2009.[11] Unlike other KERS that were developed for F1, the Williams system is based on using kinetic energy stored in a flywheel rather than batteries. The GT3-R has two electric motors, each developing 102 brake horsepower (76 kW), driving the front wheels to supplements the 480 brake horsepower (360 kW) four-litre flat-six engine at the rear[citation needed]. It is planned to enter the car in the 2010 24 Hours Nürburgring.[12][13] As part of the build up to the 24 hour race the GT3 Hybrid made its racing debut at the VLN 4 hour endurance 57th ADAC Westfalenfahrt at Nürburgring on March 27, 2010.[14] On May 28, 2011, it won its first VLN race.[15] At the 2011 24 Hours of Nurburgring, weight/restrictor penalties as well as technical difficulties prevented the R Hybrid from climbing higher than 28th place. The car also ran as an unclassified car at the 2011 American Le Mans Series at Monterey event; despite starting from last place, it finished ahead of all the other GT cars and also performed the fastest GT lap of the race.
http://en.wikipedia.org/wiki/Porsche_911_GT3