That is the actual Scientific factor WAY over my head. I was looking for the correction factor to make the Mustang === Dyno Jet HP #'s more equal. I heard that you add about, ABOUT, 10% to Mustang #'s to match what a Dyno Jet see. IE Mustang #: 300 HP Dyno Jet would see 330hp 300 + 30 (10%) = 330 Just what I have been reading/hearing -Slyder