Unfortunately for 2004, the ACO decided to alter the Le Mans Prototype rules due to the inherent problems of the LMP675 class. The classes were restructured into LMP1 and LMP2, and the MG's found themselves moved into the top LMP1 class. Over in Europe, Ray Mallock Ltd. would carry on the MG name in the new Le Mans Endurance Series. The car performed well over the short season, finishing all races and achieved a best finish of fifth, earning them fifth in the teams championship. In America, Dyson would continue with their two-car squad, while Intersport would continue with their Judd-powered entry. Unfortunately the success of the previous year could not be repeated, as Dyson was now in the same class as the dominant Audi R8. Although Dyson was able to score an overall victory against the R8s at Mosport, the team had to settle for second in the championship. Intersport's hybrid car failed to perform, managing to score points in only two races. For Le Mans, both Ray Mallock, Ltd. and Intersport would participate, yet once again neither car finished. Intersport's car was taken out in an accident, while RML's entry blew an engine in the closing hours of the race.