A friend bought a 57C Gangloff Bugatti and it was double supercharged (once supercharger feeding to another) and pretty rare with the key decision being that it had a rebuilt engine, but the car he turned down was a standing seam car that is now in Ralph Lauren collection - it was shinier, but no one knew its true mechanical condition, so one became a pushing million dollar car and the other became a serious multi-million dollar car.