Homologation special. It’s not a term that gets applied to cars much anymore, but it’s brought us some great ones. Think, 1985 Ferrari 288 GTO, 1981-1991 Audi Sport Quattro, and 1973 Porsche 911 2.7 RS. The idea is to require a manufacturer to build ‘x’ number of road-going versions of whatever car it wants to take racing. It prevents engineers from coming up with anything too crazy and forms a tangible link between what fans see on the track and what they can put in their driveways. Then, a company like Toyota comes along and builds two road-going GT-One Le Mans racers and blows up the entire notion.