Yeah they would be good for 13.3s with a "professional" driver up north somewhere where they test on them where its alittle cooler. its alittle muggier over here. There are very few and far between stock ls1s that ive seen run 13.3s . dont get me wrong my buddys went 13.1 but like you said its all driver. Also the guy in the cobra just could be throwing numbers out just to make him think it runs that. But why argue about it . Just line them up again and do it..