Just a quick lap from Mike's ZL1 with 300tw Michelins on it, it is truly a lesson in patience with going to the throttle and trail braking. The car has a good amount of camber in the front but not the rear, so it's actually pretty loose. With more rear camber and more time to learn the car it probably has a 38 on these tires, hopefully a 34 on the factory 3R's.