How many miles do you have now? Which side Bank 1 or Bank 2 the first time?I'm running the W4M tune and just drove over a thousand miles from CT to FL and had no problems with the car over heating and the temps were hit the 100's a few times in the trip. I did however get the infamous bad cat code when I got down here. But I got it already once 15,000 miles ago before the tune and had it replaced. So I think its just the car not the tune.