Unsure Adger, I bought my wife a 2000 Z28 auto, 2.73 LSD bone stock @ Atco ran 13.10. I installed a Yank 4400 converter and it ran 12.30's stock with ET Streets. A couple years later I bought her a 2004 Zo6 6 Speed 405 hp LS6 - The camaro was faster!!!
