the mustang dyno loads the engine differently according to input from the user. Any time you add the human element and varying loads, things tend to stray.

I like the dynojet, because no matter the car its a consistant load. And easier to compare apples to apples

 

I c. Iv had mine on dwains mustang dyno with my 5.3 and it went from 316 to 382 with a 52 jet. Seemed low to me but it knocked off a full sec and 10mph at the track. Dont mean to get off topic here but thanks for the info..