The first Group 4 Panteras were entered into the 1972 24 Hours of LeMans. The problems of the car then began to become apparent. The engine proved to be unreliable and the car was also subject to a weight penalty, increasing the weight to . This was set reportedly high due to Porsche's influence over the governing body of the race. Another problem of the car was the rigidity of its chassis. Nevertheless, the car continued to compete in Group 4 and the engine problem was addressed by sourcing replacement engines with a lower compression ratio. A total of 14 Group 4 cars were made. Some Group 3 cars were modified to Group 4 specifications by privateers.