Bristol Dirt: Racing, Drones, and Controversy.

Racing the Next Gen car at Bristol requires significant modifications, including using a throttle-body air filter, placing grates over the radiator air inlet openings, and replacing the underwing with a "dirt event debris shield." Visibility remains a challenge, but laminated polycarbonate windows will stay in place for safety reasons. Kyle Larson will start on the pole for Sunday's Cup race on the dirt at Bristol Motor Speedway.