humm..
Well they do have a base run and and after with the mods and it is 40hp more thats a fact.. But keep in mind those dyna pack hub dyno read high... Its not a load base dyno so it doesnt put load on the tires, it just spins freely with no resistance.. Dyno Dynamics, Mustang dyno, and dyno jet (roller type)...
"Mac Daddy" Dyno Dynamics
IMO The Dyno Dynamics is one of the best Dynos out there.. Some people dont like it cuz they usally get low number.. As far as tunning the DD and the Mustang hands down.