From the late 1980s, the Holden HQ was used in Australia as the basis of a one-make motor racing category with an emphasis on cost. The category began in Tasmania but very quickly expanded to every state and New Zealand to become the entry-level motor racing category nationwide. The cars are built to comply with CAMS Group 3H Technical Regulations. The series is utilises the 202 ci/3300 cc size six-cylinder engine, the largest six-cylinder engine sold in the car, and is limited to four-door sedan bodied cars.