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I've run my car on a dynojet and a mustang at our last dyno day the difference was 12% on the button for all the cars that were run that day. They should have run you to red line and hit the rev limiter in 4th gear.
Did dyno today, they are going to email me the charts - 250hp and 234 ft lb in 4th gear . I'll have the sheets so you can see @ what RPM etc either later today or tomorrow