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The GT3 was based on the standard 996 Carrera, but was stripped of a great deal of equipment for weight savings, featuring stiffer, adjustable suspension and upgraded brakes. The GT3 used the bodyshell of the four-wheel-drive Carrera 4, which incorporated additional front-end stiffening. It featured a naturally aspirated 3.6-litre flat-six engine generating a maximum power output of 360 bhp @ 7200 rpm and torque of 273 ft lbs @ 5000 rpm. This engine was shared with the 996 Turbo and was a derivative of the engine developed for the 911 GT1 race car.
The second generation GT3 takes all that was good about it's predecessor and then improves it! Power from the GT1 derived flat-6 is up by 21 bhp to 381 bhp (with an 8200 rpm redline), ride height is lowered for increased stability and also has an upgraded braking setup, as it features a 6-piston calipers on the front. Two versions are offered, the more extreme 'Clubsport' showing it's track day colors with a full roll cage, racing seat and a 6-point harness. The 996.2 GT3 was the first GT3 marketed in the North America. The new Porsche 911 GT3 comes with all the features of half a century Porsche motorsport. It is a sports car for the purist through and through.
Towards the end of the 996 production run, Porsche introduced the Turbo S, boasting even more power than the standard 996 Turbo — 450 PS (331 kW) and 620 N·m (457 lb·ftf)— courtesy of the X50 package being standard. The Turbo S was limited to approximately 1,500 units worldwide, of which 598 were coupé (hardtop) and 960 were cabriolet (convertible). It was available with a 6-speed manual or an automatic (Tiptronic S) transmission, driving power to all four wheels. The basic price is EUR 122,500 for the Turbo S Coupé or EUR 131,100 for the Turbo S Convertible. Sprints from zero to 200 km/h in 13.6 seconds.
In 2002, all of the standard models received a minor makeover in 2002 which included Turbo-style headlights, a freshly designed front clip and an increase in engine capacity to 3.6L along with a subsequent 20HP boost. The bodies were more rigid which further improved handling and safety and the lower, stiffer X74 suspension became available as a factory modification. From the outside, it was hard to notice the difference between the 1998 version and the facelifted model. The main difference was on the headlights. Including the Mk 1 cars, the 996 Carrera Coupe sold 46,317 units.
The 996 GT3 Cup served as the basis for the 996 GT3 road car, featuring a 3.6 litre engine with 355 hp. For the 1999 season the engine output was increased to 365 hp. For the 2001 season the GT3 Cup received modified aerodynamics including an enlarged rear wing and improved cooling. For 2002, the GT3 Cup received several changes, adopting facelift 996.2 features such as Turbo-style headlights. The new body significantly improves aerodynamics and cooling. Engine output was increased to 380 hp. For 20003 onward, the power was hiked once again, with the engine now pumping out 385 bhp @ 7250 rpm and of torque 288 ft lbs @ 6500 rpm.
From model year 2001, the model range was extended to include the 911 GT2. The body of the extreme sports car was based on the body of the 911 Turbo. The GT2 engine was also based on the 911 Turbo but had ten percent more power. The bi-turbo engine delivered 462 horsepower. The GT2 was offered with a Clubsport Package for use in motorsport. In late 2003 the Porsche 911 GT2 received a power upgrade from 462hp to 483hp, maximum torque also increased from 457 lb ft to 472 ft lbs, thanks to a revised engine management program. Top speed increased by 2mph to 198mph while 0-60 is claimed to take 3.8 sec.
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. 
In 2002, the standard Carrera models underwent a facelift. In addition, engine capacity was also increased to 3.6-litres across the range, with power up slightly on the naturally aspirated models. 2002 also marked the start of the production of the 996 based Targa model, with a sliding glass "green house" roof system as introduced on its predecessor. It also features a rear glass hatch which gave the driver access to the storage compartment. The 996 Targa is the rarest bodystyle in the series – only 5,152 were produced (all Mk.2 generation) between 2002 and 2005.
The 996 Carrera 4S Cabriolet is the convertible version of the slightly-uprated 996 Carrera 4. Introduced a year after the 996 C4S Coupe. The Carrera 4S Cabriolet was introduced in the lineup with the new engine and the Turbo bodywork. The cabriolet version of the Carrera 4S paired the aggressive bodywork and suspension of the Turbo with the base Carrera 4 drivetrain, though it didn't get the Turbo's huge rear wing. The three-layer canvas-top was powered and it needed 20 seconds to completely retract or cover the car, at speeds up to 50 kph (31 mph). For winter, the car featured an aluminum hard-top.
Introducing this new top-of-the-range model, Porsche is once again placing a 911 Turbo Cabriolet right at the top of the family after a break of 14 years: From 1987 - 1989 the Porsche 930, as the first Turbo was code-named within the Company, set the first milestone in the history of these outstanding open-air sports cars. With cylinders still featuring two valves each at the time, the 3.3-litre power unit driving the first Turbo Cabriolet offered maximum output quite unique at the time of 300 bhp or 221 kW. Acceleration from 0 to 100 km/h was in 5.2 seconds and the car had a top speed of 260 km/h or 161 mph.