I dont know about the Diablo chip in a F-250.. I do have experience with the chip in a 01 Mustang and one in a 02 S-crew. The mustand picked little to no true performance gains IMO. S-crew however picked up what I guess to be is 15 extra horses all the way acroos the band and 3 mpg on the highway.
Now.... as far as my other experience. I have experience with a Power Programmer in a 02 F-350 4 door dually. Can I say Holy Schnikies... Big Power gains in every gear. ( this truck is a 2wd w/ 6 speed ). Now. .the programmer claimed something like 100 extra horse, 100+ ft. lbs. or torque, and 10 % better mileage.... Wel lits al ltrue but hte mileage.. .If he doesnt care to improve the mielage.. I say go for the programmer.... Other than that im not sure what to tell you. All I know is since the F-250, if he does ANY hauling or towing at all..... GET THE PROGRAMMER.
Bradley
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1990 GT, 347, TFS TW Heads, TFS Cam, TFS Track heat, Twin turbos, FMIC, T5.
Built Ford Tough Moderator
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