Many have read my vexing problem with instability of the rear end on bumps which has completely resolved with GY ComforTread tires. I just read the C&D review of the Z06 which smoked the Viper. The Z06 has the same rear end kick as my 300C (I should feel special). C&D reports "A chassis that does'nt know how to communicate and snap oversteers at will", "Grattan's track gave the Z06 fits. It never felt comfortable or sure of itself and gave us all disconnected, spooky feelings..." "If the Z06 encountered any bump or lump in the pavement as it was exiting a corner, the result was a nearly instantaneous outward snap of the tail" It all sounds so familiar, more dramatic than my C, but familiar nonetheless. C&D recommended before you take a Z06 to the track "modify it's suspension or get new tires", deja vu all over again.