one of friends has a 97 f 350 crew cab.high flow exh cool air intake and a wildman programmer.wildman makes a programmer specific to your truck and with whatever settings you want.my friends truck on extreme blows black smoke like a dodge and hauls ass.his also has tow,economy(which has 40 or 60 horse over stock i can't remember) he avg. 17 mpg w/ camper from utah and back.anyhow when you order from wildman he needs vin and trans codes tire size etc. my other friend's truck is more powerful but i'll have to ask him tomorrow what he has i forget. hope this helps.also check out dieselstop.com and look up programmers. lots of useful info there to!