Yes, it's kinda spooky to read about L.'s with blown motors, but....How many members are on the F150 online L. board, and what percentage of those folks push their trucks pretty hard, either by tuning or by driving habits, and we're seeing what, 7 blown motors? That's really a pretty insignificant percentage, unless it's your truck.
Tom, you can't go wrong staying stock. Dennis makes a good point about the bracket racing, and it's still one of the highest performance vehicles you can buy.
Everyone has their tolerance level. I was greedy enough to really want a chip, but conservative enough to ask for a burn that was something less than full throttle. Time will tell if any of us has made the right choices. I'm at 43,000 miles, and keeping my fingers crossed, since I plan on getting 150K out of this truck.