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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.
Even more powerful, faster and more dynamic than ever before, the updated 997 Porsche 911 GT3 (differentiated from the earlier with a new 997.2 designation) is about to prove its enhanced potential. The Porsche 911 GT3 now reaches an even higher standard in its two main qualities: power and driving dynamics. The naturally-aspirated six-cylinder now increased in size to 3.8 litres is 435 bhp (320 kW), up 20 bhp over the previous model. In particular, the flat-six power unit carefully upgraded for even more muscle and performance offers a significant increase in torque at medium engine speeds. Road performance is spectacular.
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. 
If the 996.1 911 GT3 was all about the engine, in the 997.1 completes the rest of the formula. The surgical clarity of its transmission, steering, brakes, pedal weights and heights, and overall chassis balance represented a clear step-change from its regular 997 911 siblings. But the engine was still the heart of the car, the water-cooled 3.6-liter flat-six boasting a new intake and a new exhaust compared with the 996 versions. Official output was 415 hp, though insiders admit some engines made close to 430 hp. Launched in 2006, today this is in many ways the sweet-spot GT3, way more affordable than the later 4.0.
Matt Farah Reviews the 991.1 GT3 The latest generation of GT3, the 991. Matt reviews a 2015 Porsche 991 GT3 on Little Tujunga Canyon Rd! The 991 GT3 features a 475 HP flat-six engine, PDK gearbox, and in this base model, steel brakes....
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.
Porsche introduced the 991 GT3 for the 2014 model year, as follow up to the multiple 997 GT3 variants. The 991 GT3 featured a new 3.8 litre direct fuel injection (DFI) flat-six engine developing 475 hp (354 kW; 482 PS) at 8,250 rpm, Porsche's Doppelkupplung (PDK) double-clutch gearbox, and rear-wheel steering. The 911 GT3 is claimed to be able to accelerate from 0-60 mph (97 km/h) in 3.1 seconds or less, and the quarter mile in 11.2 seconds at 126 mph (203 km/h). It evolved into the 991.2 GT3 for model year 2018.
The new Porsche 911 GT3 Cup is powered by a 3.8-litre six-cylinder flat engine. It generates 460 hp (338 kW) at 7,500 revs, surpassing the predecessor by 10 hp. A six-speed dog-type gearbox developed by Porsche Motorsport which is operated via shift paddles at the steering wheel for the first time in a Porsche brand trophy race car transmits the power to the rear axle. The single piece race wheels with centre mount were also new.
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.
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.