The Porsche 911 Carrera RS built in 1973 and 1974 is one of the most prized by collectors today. Considered by many to be the greatest classic 911s of all-time, the RS stands for Rennsport in German, meaning race sport in English. The RS was built so that Porsche could enter racing formula e that demanded a minimum of 500 production cars were made. Compared with a standard 911S, the Carrera 2.7 RS had a larger engine (2687 cc), stiffened suspension, a “ducktail” rear spoiler, larger brakes and wider rear wheels and fenders. In total, 1580 units of the RS were made.