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dyno jets read higher then most its all the manufactures opinion on what hp is. i first had it on a mustang dyno i made 265/299(no clue what A/f ratio was) then a few months later when i first put it on the dyno jet it made 270/306 with a A/f of like 14.7:1 after taking it down to 13:5:1 it made the 279