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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. 75 flatnose units were produced.
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 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 1989/90 change of model year saw the launch of the Porsche 911, 964 series onto the market. This 911 model was initially available as a Coupe, Targa and Convertible. From model year 1991 onwards Porsche also introduced its top-of-the-line model - the Turbo - into this series. In spite of bearing a major similarity in terms of look to the naturally-aspirated model, the extended wings remained. This meant that the new Porsche could retain its turbo look. The 964 Turbo model was the successor to the Porsche 930. The 964 Turbo was the end of an era, the last of the single turbo rear-wheel drive 911 Turbos.
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.
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.