'94 to '97 and early '99 Power Stroke and International 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. Some trucks, depending on tolerances, may be able to utilize up to 80 HP and 120 HP respectively, but we cannot guarantee that the power gains will be achieved. Trucks with modified injectors are not subject to these restrictions.
this is straight from the website. i am taking it as if the most you can go for a early 99 is 100HP
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