I just did a quick search and found two guys on the Corvette Forum. Both LPE vettes one (DJ Self) has run a 10.4 but that was on BFGs and the other (SlowC5) ran an 11.2 on Michelins. I am sure saw info about someone running a high 10 on Pilot Sports. I'll keep looking but until then the best I can provide is an 11.2.