You will feel/see no difference in 65-140 HP calibrations on your stock injectors. If you order a "140 Extreme" program, it will be a re-labeled 80 Performance program.
The smokeshow will not smoke excessively (and that's a good thing) on the older trucks because of the stock injectors.
From the Phoenix product page on the website:
" '94 to '97 and early '99 Power Stroke trucks are fitted with smaller volume injectors than the late '99 and up Super Duty trucks, and as such are limited to increases of about 65 HP for the '94 to '97 and 100 HP for the early '99."
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