IMCA Modifieds, IMCA Sunoco Stock Cars, IMCA Sunoco Hobby Stocks and Karl Kustoms Northern SportMods complete the card. BOONE, Iowa – Mach-1 Sport Compact drivers will have another opportunity to race at Iowa’s Action Track before taking their turn on the big stage during the IMCA Speedway Motors Super Nationals fueled by Casey’s. The division has been added to the card for the Saturday, Sept. 5 Wild Rose Casino Prelude at Boone Speedway, running for a top prize of $150 and a minimum of $25 to start. Non-qualifier pay will be $25. Pit gates open at 2 p.m. and the grandstand opens at 3 p.m. Hot laps are at 4 p.m. with racing at 5 p.m.