I'm worried about that engine. I'm going to be getting a new Excursion soon, and I'm sure it will have the 6.0 in it. There is another thread on here that someone said that the 6.0 is pretty maxed out, and that the 7.3 is only 60% utilized (or something like that). I never did chip or enhance my 7.3, but was going to consider it on the next X. Is the 6.0 really maxed out?