Porsche built 25 917s for homologation in 1969. It won Le Mans in 1970 and 1971, only losing when the rules changed. The 917 still holds the Le Mans fastest lap record.
It was the first car most people could afford. And it was the first car around for which an industry was built to improve it. The aftermarket was invented around the Model T with everything from paint to speed parts.
