 Camel became the title sponsor during the second season, with the series becoming known as the Camel GT Challenge Series.The sponsor's corporate decal had to be displayed and clearly visible on the left and right sides of all racecars, and Camel's corporate logo patch was also required to be on the Nomex driver suit's breast area, featuring Joe Camel smiling and smoking a cigarette while driving a race car.Initially, all cars were identified with a category tag, stating which category they competed in, but from the middle of the 1975 season on, all cars within the series had to have a rectangular "IMSA GT" decal, which incorporated its logo on the left, followed by a large GT tag,
as well as a Joe Camel decal.