Afterwards
At the start of the 1980 season, BMW announced their intention to enter Formula One as an engine supplier for Brabham. The deal came in part due to Bernie Ecclestone, then head of Brabham, as well as the head of BS Fabrications, who had built several of the Procar M1s. BMW planned to enter the series in 1982, and BMW Motorsport was tasked with concentrating their efforts on the new Formula One engines instead of the Procar series.
That same year, BMW officially met FISA's requirements by having built approximately 400 cars. The M1 was therefore homologated for Group 4 on December 1, 1980, allowing BMW to enter the Championship for Makes in 1981. As BMW shifted towards Formula One, the company ended their plans to enter the Group 5 category after the construction of only two race cars. With BMW no longer needing to quickly build race cars, and with BMW Motorsport shifting to Formula One work, the series was not held in 1981. The M1s used in the Procar series were sold to various customers for use in the World Championship, as well as smaller series such as the Deutsche Rennsport Meisterschaft and Camel GT Championship.
In 1988, Motor Racing Developments, the owners of the Brabham Formula One Team, were sold to Alfa Romeo. Wishing to revive the Procar series, Brabham and Alfa Romeo developed a prototype racing car using a mid-mounted Formula One-based V10 engine, covered in a bodywork silhouette mimicking the Alfa Romeo 164. Alfa Romeo intended to use identical copies of the car for a resurrected Procar series, but the plans never came to fruition and only the prototype was built.
Read more about this topic: BMW M1 Procar Championship