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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.
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.
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.
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.
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.