The Dr. Ing. h.c. F. Porsche AG was the most heavily represented manufacturer at the 24 Hours of Spa-Francorchamps, fielding 15 race cars. The Ardennes classic is the fourth round of the GT World Challenge Europe Endurance Cup and part of the Intercontinental GT Challenge.The Dr. Ing. h.c. F. Porsche AG was the most heavily represented manufacturer at the 24 Hours of Spa-Francorchamps, fielding 15 race cars. The Ardennes classic is the fourth round of the GT World Challenge Europe Endurance Cup and part of the Intercontinental GT Challenge.