keanoknick
Big Stroker

Guages should definantley be the first thing on your list, wether they be individual, like isspros or autometer, or wether you get an all in one digital guage display, do what fits your style/budget.
I second what WD40 said, our 6.0 factory intake and filter flow very well for our trucks. I don't know which is which, but I know a few of the intakes availabe for the 6.0 actually have caused power loss, A friend of mine writes articles for alot of big magazines, ie. diesel power, 8-lug, truckin, etc... , and has tried out 5 or 6 intakes on his '04 6.0, with minimal success. I'll see if I can get ahold of him and find out which one gave the greates HP gains.