Power seems to be a big one for some reason. The 04's run really good. The biggest difference that I can think of, is the badazz coil front spings on the 05 :nod:. A square style EGR cooler on the 05, vs a possible round style one on the 04, depending on the build date. The Round ones were said to be a little stronger :dunno: Some injector problems, again depending on the BD of the 04 That's all I can think of right now. Make sure he gets and Oasis report on each one before making a decision though, he doesn't want to get into a problem truck