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The Turbo-look Porsche 964 has always been a very desirable automobile, among them 1,532 Carrera 2 Cabriolets constructed worldwide. Within that group, there were some cars that were even more specialized. The Register says six Turbo-look cabriolets were pulled off the production line in Zuffenhausen and transported to the Porsche Exclusive shop in Weissach. Three of these six powerful and luxuriously equipped drop-tops were equipped with left-hand drive for buyers in Germany (Code C00), and the other three were fitted with right-hand drive
19 non 'slant nose' or Package cars were made for the USA only. Very rare. The Porsche factory had 93 Turbo chassis left. These were all transferred to Porsche Exclusiv and hand built as the very special 964 Turbo 3.6 S. They were offered with normal, or ‘Flachbau’ slant nose front ends. While the vast majority of Turbo S’ were fitted with the ‘Flachbau’ nose as a no-cost option, the Turbo S could also be had with the traditional 964 nose as well. In all, 76 Flatnose cars were made while 17 non-Flatnose (known as Package option) cars were made. These cars were also fitted with the X88 option, which increased power to 380 hp.
Engine based on modified 3.6 litre 964 unit. Speedline wheels with big red brake calipers. Lessons learned in the Carrera Cup series proved the reliability of the new 3.6-litre engine. An additional three millimetres on the bore and two millimetres on the stroke, resulted in an increase in capacity of 300 cc. Combined with the turbo optimised cylinders, pistons and crank train, and an increase in the compression ratio from 7.0 to 7.5:1, this helped to boost power to 360 bhp. Torque was increased significantly to 520 Nm at 4200 rpm, up from 450 Nm at 4500 rpm in the earlier car.
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. 
The original 1973 Carrera RS was available in Europe but not in the USA. Porsche decided to build the 1993 Carrera RS both to European spec and a limited number in compliance with US regulations. These US spec cars were assigned the name “RS America”. The intent was to create a basic lightweight, no frills 911 with minimal luxury options. The standard US Carrera 2 brakes, engine and gearbox were used. The RS weighed 2,945 pounds so it was almost 80 pounds lighter than a standard Carrera 2. 
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 made a lightweight version of the Turbo simply known as the Tuubo S. This used the spartan appointments of the Carrera RS with an upgraded version of the Turbo engine. Some cars received graphics on the side celebrating IMSA Supercar Championship. Similar to the Carrera RS, the Turbo S had no power steering, air conditioning, airbags, central locking, alarm system, rear window wiper, smaller window washer reservoir, smaller horn, and had thin-gauge glass. The engine used a second oil cooler and slightly higher boost to improve overall performance.
The 964 Carrera RS 3.8 was produced as a base for homologation for the venerable 3.8 RSR. It was unveiled in 1993 and produced in a very small series by Porsche’s Racing Department in Weissach-Flacht, and was an extreme evolution of the 964 Carrera RS that was released two years prior. It featured the wide-body look of the Type 964 Turbo, a massive rear spoiler, and three-piece “Speedline for Porsche” wheels with 235/40 and 285/35 tires, making it distinctively more aggressive in appearance than the fairly restrained styling of the Carrera RS of 1992 and capable of providing significantly more mechanical grip.
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.