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Porsche 911 Carrera 2 Targa (964) (1990 - 1993)
Like the Carrera 4, the Carrera 2 was available as a coupé, Targa or Cabriolet. This was the last generation Targa with traditional removable Targa roof (till 991). It sold ok, with 3,534 units sold over its lifetime. The engine was the 3.6 liter unit which produced 250 horsepower and a maximum speed of 162 mph while the 0 to 60 mph acceleration was made in about 5.6 seconds. Performance was on par with the coupe and it is the looker in the 964 range.
Porsche 911 Carrera 4 Targa (964) (1990 - 1993)
This was the last generation Targa with traditional removable Targa roof (till 991). The Carrera 4 Targa outsold the Carrera 2 Targa by 2x, making the 4 Targa much rarer and more collectible. In all, only 1,329 units were made. Overall, the Carrera 4 packed almost the same technical specifications as the Carrera 2 model. The Targa top was quite a project to take off (compared to the simple and fast cabriolet process) so be prepared to garage it all the time or spend 20 minutes every time you want to enjoy open top fun.
Porsche added the rear wheel drive Carrera 2 variant to the range in 1990. It was developed alongside the 964 Carrera 4, Porsche waited a year to release the Carrera 2 as a 1990 model year car. Like the Carrera 4, the Carrera 2 was available as a coupé, Targa or Cabriolet. Think of the cabriolet as a C2 coupe but with a fabric roof and more fun and you are right on the money. It was popular amongst buyers, particularly in the United States, with a total of 11,013 units sold, making it the third most popular 964 model. 
Porsche 911 Carrera 2 Coupe (964) (1990 - 1994)
Porsche added the rear wheel drive Carrera 2 variant to the range in 1990. It was developed alongside the 964 Carrera 4, Porsche waited a year to release the Carrera 2 as a 1990 model year car. Like the Carrera 4, the Carrera 2 was available as a coupé, Targa or Cabriolet. Overall, the Carrera 2 packed almost the same technical specifications as the Carrera 4 model. The engine was the same 3.6 liter unit which produced 250 horsepower and a maximum speed of 162 mph. Looked like C4 but was 200 lb lighter and more fun to drive.
The 964 Carrera RS (Standard) was introduced by Porsche for model year 1992 specifically for the European market as a lightweight, high performance version of the 964 Carrera 2. It featured a revised version of the standard 3.6 liter engine, titled M64/03 internally, with an increased power output of 260 bhp (194 kW; 264 PS). The RS does not look much different from the other 911 models of the period but its weight is reduced and power increased. True to its racing spirit, the Carrera RS featured bucket seats and thinner materials, but lacked power windows, air conditioning, air bags, and other creature comforts.
Porsche 911 Type 964 Carrera 2 'Works Turbo Look' Cabriolet was a special model in the 964 lineup. It gave buyers of the Carrera 2 Cab the great wide look of the Turbo cars and the Carrera 2 engine. The model was available as a 1992 and 1993 model year car (while some argue it was also available for a while in 1994). You get body shape of the 964 Turbo 3.3 without the huge rear spoiler. But this was more than just a design exercise, because the the Turbo-Look models also got the chassis and braking system from the Turbo 3.3 too. 
The rarest 964 RS variant was the awesome 964 C4 Lightweight. Known as the 964 Leichtbau it made use of surplus parts from 953 Paris-Dakar project. A handful of specially prepared lightweight 911s were fabricated by the Porsche factory and called the Carrera 4 RS Lightweight. Carrera RS Body with 959-like AWD wizardry and more power. Lightweight masterpiece. Used parts from 953 Paris-Dakar project. The 964 C4 Lightweight was powered by the same 3.6 liter flat six as the normal 964 RS, but was fettled to produce 300 hp.
Porsche 911 Carrera 4 Cabriolet (964)
The Carrera 4 model also launched with a Cabriolet version in 1989 (for 1990 model year). The new 911 generation is introduced in Autumn 1988, but the convertible was not launched until the model year 1990. Alterations to the body include the bumpers and sill tread plates, and the 911 continues to be equipped with an automatically retractable rear spoiler and a cowled underbody. The braking system is fitted with ABS. The 911 (Type 964) also features power-assisted steering for the first time. Like the Coupe, the Cabriolet got the new all-wheel drive system.
The Type 964 911 first launch with an all wheel drive model. It was a serious investment by Porsche in updating the chassis and tech platform. The 964 Carrera 4 was powered by the M64/01 3.6 liter flat six engine, developing 250 bhp and 229 ft/lbs of torque. The objective of the C4’s all-wheel-drive system was not only to provide improved traction but also better handling, especially in the wet and on slippery surfaces. The system sends power front/back in a 31:69 ratio because a 50:50 split would have made the 964 feel like a front-wheel-drive car.
With the 1993 Carrera 2 as the starting point, Porsche had to make at least 50 roadgoing cars in order to qualify this new model for the Carrera ADAC GT Cup, which served as the basis for a motor racing variant to come, the Carrera RSR 3.8. The RSR 3.8 was nothing short of an all-out race car that could be delivered to the track in a ‘just add driver’ form. The Porsche Carrera RSR 3.8 racked up a catalogue of impressive international race results right from the outset, winning overall at the Spa 24 Hours, Suzuka 1000km, and the 24 Hours of Interlagos.
For race teams and track day customers Porsche prepared a small number of the 964 Cup cars according to the FIA NG-T regulations. Officially called the Competition model, these custom-ordered cars were an intermediary step between the Carrera Cup option (M001) and the standard tourer (M002). This M0003 option was available directly from Porsche as a road-going model. These cars had almost all the Carrera Cup modifications including the new suspension. This lowered the car by 40mm in the rear and 50mm in the front. It also included fitting of the larger 930 Turbo disc brakes and adjustable anti-roll bars.
Introduced in 1989 (the year of the 911’s 25th anniversary), the 964 Carrera 4 was a significant new model for the company, but the 4-wheel drive system was deemed unsuitable for the company’s racing series. Manufactured alongside the Carrera 4 at the same time was the more traditional rear-wheel drive Carrera 2, but this model’s launch was only planned for a year later, in the hope that it would not detract from potential sales of the Carrera 4. The 1990 season was the first season that saw the 911-based model become the pillar on which the Porsche Carrera Cup series has been established.