When IMSA banned the Porsche 934 for the 1976 season, teams moved to the SCCA, resulting in a poor season for IMSA. To entice the Porsche teams back, IMSA had Peter Gregg test a 934 modified with the rear wheels and wing of a 935, which Porsche was building ten examples of, known as the 934.5. Deciding that it wasn’t going to dominate the series, they let Gregg enter the first race. However, in the meantime he’d added a bunch of 935 parts so they wouldn’t let him start at Road Atlanta. Instead of removing the equipment, he got the SCCA to approve the 934.5 and he dominated the 1977 SCCA season, winning six races and the championship. Well, until a competing Porsche team appealed his victory in the Mosport race in Canada to the FIA, which had jurisdiction because that race was part of the World Championship. The FIA ruled against Gregg, Porsche issued a commemorative poster with Gregg as the champion and Canadian Porsche dealer Ludwig Heimrath, who had filed the appeal, listed in second place.