Pur Sang, which originated as the French term for pure blood, is an old horse racing term to describe a genuine thoroughbred.
The phrase also refers to the Argentina-based company that hand-builds Type 35 Bugattis as exact replicas of the originals. Pur Sang Argentina produces more than 20 Bugatti Type 35s a year, among other models, that contain the same components—no more, no less—as their now multimillion-dollar predecessors.