The mustang dyno does it's calculations in a totally different way than the dynojet, it does load the vehicle in a different manner as well. There is no conversion, because of the way mustang dynos work, it allows for large error margin based on operator. A dynojet is pretty much idiot proof and will yield repeatable consistant results as long as they are at the same altitude all dynojets will read very very close to the same. Mustang dyno's acuracy is all based on operator, and can be swayed in one direction or the other easily enough that it is impossible to compare the two numbers wise, or any two mustang dynos for that matter.