1973 Porsche Carrera RS The 1973 and 1974 editions of the Porsche Carrera RS are among the most coveted of all 911s. They pack a 210 hp 2.7-liter motor, which doesn&#x27;t sound like much until you realize they weigh less than 2400 pounds. They were very quick.   Read more: The Best Cars from California’s Ultimate Week-Long Car Show - Popular Mechanics  Follow us: @Popular Mechanics on Twitter | popularmechanics on Facebook  Visit us at PopularMechanics.com