The M2 was built in 1968 for the new 3 Litre Group 6 Prototype class, but the BRM V12 power cars were rarely raced and met with no success. The revised M3 of 1969 was powered by the Ford Cosworth DFV V8 but again this model saw little use, JWA having largely concentrated on racing Ford GT40s during these two years.
After competing with Porsche 917s during the 1970 & 1971 seasons, JWA developed the new Ford Cosworth powered M6 model to race as a Group 5 Sports Car in the new World Championship for Makes from 1972. Again the only victory was at Spa, in the 1973 Spa-Francorchamps 1000 km.
Gulf Oil sponsorship, which had continued each year from 1967 took a new turn in 1974 when the new GR7 model was badged as a Gulf GR7, thus ending the era of JWA's Mirage cars.