Just finished about 4 or 5 WOT to clean out the carbon, probably do this 3 or 4 times a year (I do more WOT then that just not at one time). Car is now in the shop getting the head gaskets replaced. Car has just under 100,000 miles on it. Not saying the WOT caused the problem but sure seems odd that by the time I got home (two miles later) the car was overheating, just wanted to post the information, will let each of you draw your own conclusion.
BTW cooling system was maintained more often then recommended with dexcool, I will admit that the dealer used tap water instead of distilled water when they changed the coolant, also I believe they flushed it instead of just drain and replace like recommended on this board.