With KraftWorksâ Jay Healy handling the tune, Stephenâs ZL1 won the Camaro ZL1 Quick 8 class. After the Cadillac Attack, Stephen went back home to his local track and ran a 9.26 at 147 mph to break the ZL1 record. Stephen tells us since the car still features the stock transmission, he drives the ZL1 quite often on the street.