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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've had a Hypertech chip on my '88 and was very pleased with it and the performance gains it gave me. And I'm sure the technology has improved even more since I bought the chip back in '94 as these guys are always doing more R&D to get better chips.