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5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
i had a jetchip in my 94 SHO and i noticed a slight change in the throttle response and it did improve the shifts a little, but not the 20 HP increase they say id say it was about 10hp, i have the hypertech in my 88 GT and i noticed the timming advance slightly and thats about it id sa it was about the same increase in hp as the jet, but nothing that you will really notice.