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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.
like tim said the dyno will be the most accurate. if you want an est. use this, 15% loss thru a 5-speed, 25% thru an auto. it may not be accurate, but i know a LOT of mech's that use it as a rule of thumb.