The Porsche 911 Carrera RS is a classic 911 that was created as a race car for the street. Therefore, the Carrera RS is also called the predecessor of the 911 GT3. In total there have been three generations of the RS. The "original" 2.7L RS, the 964 3.8L RS and the 993 RS. All of the RSs are extremely rare and a perfect store of value. With only 55 cars made, the 3.8L 964 is the rarest out of the RSs.