The Porsche 911 RS 2.7 was built from 1973 to 1974. This car was built as a homologation special for Porsche’s participation in motor sports (FIA Group 4 Class) as a minimum of 500 cars had to be sold to the public. This car is fully tuned, from stiffer suspension, better brakes, and more horsepower as well as styling cues to set it apart from the standard Porsche 911. The 2.7L flat six-cylinder produces 210 horsepower which made it the most powerful 911 available.
Below is a Japanese program that shows footage of the 1973 Porsche 911 RS 2.7