The original form of GT1 racing was dropped in 1998 because of rising costs. The GT1 class was for the purebred supercars and purpose-built race cars, such as the McLaren F1 GTR, Ferrari F40, Porsche 911 GT1, Mercedes-Benz CLK GTR, Toyota GT-One and Nissan R390 – while the first two were a derivatives of road-going sports cars, the German and Japanese contenders were pure-bred racing cars – virtually sports prototypes. Rising costs coupled with declining entries led to the death of this class, and it was replaced by what is called GT2 (FIA, which later evolved into the GT1) and Le Mans Prototype (LMP, by the ACO).