Don't have the lap numbers at hand, but the last time I double check it. MT's Randy Pobst was faster in the SS 1LE at Laguna Seca compared to the Z51. But on C&D's Lightning laps the Z51's lap time was better than the SS 1LE. Probably would depend on the type of track and/or who's the driver. Stingray Z51 lighter, lower, more aerodinamic vs SS 1LE with wider wheels & tires, same engine, Z51 7 speed VS SS 1LE 6 speed manual transmissions.