Parker prevailed in a caution-plagued affair for Sunoco USRA Factory Stock warriors and Brandon Harrod was the USRA Tuner feature winner. Henigan powered to victory in the 30-lap main event for the American Racer USRA Modified Series and Tupper claimed his win in a talent-filled tilt for the USRA Limited Mods. earned feature wins in their respective divisions Saturday night at the Boothill Speedway as officials hosted the Summit USRA Southern Nationals. Chris Henigan, Coty Tupper and John Parker Jr.