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2001 Porsche 911 GT3 RS Race Car (996) (2001 - 2004)
In the 2000 FIA GT Championship, the 996 GT3 R was the dominant racer in the new N-GT class and won every run. In the same year, the factory-supported Phoenix Racing won the 24-hour race at the Nürburgring. In 2001, the modified version, now called the 996 GT3 RS, was used. The vehicle was not only very successful in its class, it also achieved overall victories. Modelled on the 911 GT3 R, the GT3 RS race cars offered a number of technical improvements, which combine to ensure a racing car with optimal competitiveness. 50 racing cars were produced.
For those who want more extreme performance, handling and track-day bragging rights, the RS is it. It's far from practical and may be too extreme for some, especially on the street, but on track it is exceptional. Only marginally quicker than the 991 GT3 that it is based on, but it delivers that performance with a different character. Massive grip, massive downforce and more extreme than the GT3. It delivers 80 per cent of the downforce of the full-on GT3 R race car, and with a carbon fibre bonnet and wings, a magnesium roof and polycarbonate rear windows and screen, it’s also light, weighing in at just 1,420kg.
The 997 911 GT3 RS is an even lighter and more purist version of the 911 than the regular GT3. 20 kilograms lighter than the GT3 and equipped with a close-ratio six speed manual the GT3 RS gets to 60 mph 1/10th of a second faster than the GT3. The 911 GT3 RS is 44mm wider at the rear than the GT3. The wider track helps improve directional stability when cornering. Weight savings can be found throughout the car. The Clubsport version there is a bolted roll cage, a six-point harness for the driver and a built in fire extinguisher. 
Based on the already primal 997.2 GT3, the RS gets another 15 hp from the 3.8-liter flat-six for a total of 450, or more than 118 hp per liter. A racing machine tamed for street use, the GT3 RS is hardly just about horsepower. It gets a wider track, it weighs less, and it produces more downforce than the GT3. The only available transmission is a six-speed manual gearbox (with the ratios even shorter than the GT3). A racing machine tamed for street use, the GT3 RS also gets a wider track, it weighs less, and it produces more downforce than the GT3.
This is the best 911 Porsche has ever made. The headline power figure and the ability to rev to 8,500 snare your attention, but the most staggering aspect of this engine is actually its tractability. Mid-range lunge is marvelous, even if the peak number of 339 pound-feet doesn't sound huge in the context of short gear ratios, lightweight, and a compact frontal area. In third gear, the way this thing flies between 4,500 and 8,500 rpm is scintillating. Plus, the utter progression of the delivery makes it vastly easier to take advantage of compared to the GT2's ridiculous turbo surge. This is one special car.
The 996 GT3 RS was a sharpened version of the Mk.2 GT3, built for track use and it was the homologation model for the GT3 race-car. It was the forbidden fruit for the U.S. and Canadian customers. It was available in a limited number and it was a true track-oriented vehicle. It was based on the GT3 version, but with fewer comfort features and even stiffer suspension. It was the kind of car which could have been taken from the shop and dive into the first race-track. The GT3 was available in white color only, with red or blue inscriptions on its sides. The adjustable rear wing and the “duck-tail” were mounted in the back, to provide better traction on higher speeds. It was fitted with the same engine as the GT3.
Matt Prior from Autocar nails the 991.2 GT3 RS: “While I don’t think the 3 communicates any better than a 2, the messages it does transmit are superior: you can feel that it’s lighter, more willing to turn, easier and more satisfying to ease onto the throttle and keep it pinned. It’s why this car is only a few seconds slower than a 2RS around the Nürburgring Nordschleife despite being almost 200bhp down.” He goes on... “And in the form of the GT3 RS it goes into creating - little by little, detail by detail - what might just be the best driver’s car currently on sale.”
Arguably the most extreme 911 to be build as a production car for the road and track. The most significant improvements made to the RS—over both the 992 GT3 and the previous-gen 991 GT3 RS—were applied to the aerodynamics and chassis departments of the car. The new 911 GT3 RS is even more optimized for track use than its predecessors. The spontaneously responsive, high-revving four-litre, six-cylinder boxer engine has proven ideal for use at track days and club sport events.