The International Motor Sports Association (IMSA) is the governing body and championship organizer for the IMSA WeatherTech SportsCar Championship, the top level of sports car and endurance racing in North America.

For Action Express Racing, IMSA provides the competitive platform on which the team operates — setting the technical regulations, race calendar, and sporting framework that define every aspect of competition. From iconic endurance events like Daytona and Sebring to sprint races across the US, IMSA is where the team competes, develops its Cadillac prototype, and delivers results for its partners.

The WeatherTech SportsCar Championship, sanctioned by IMSA, is North America’s premier sports car racing series, featuring a mix of prototype and GT cars competing together in multi-class endurance and sprint events.

With factory-backed manufacturers, hybrid technology in the top GTP class, and a strong emphasis on innovation, it serves as a global showcase for high-performance engineering and endurance racing excellence.