John Kachadurian, of Denver, Colo., won the GT-2 National Championship on the final lap at the SCCA Runoffs Presented by Garmin VIRB at Daytona International Speedway. Robert Kennedy, of Ormond Beach, Fla., finished second with Mark Boden, of Winnetka, Ill., completing the podium.Kachadurian scored his first National Championship in dramatic...