its possible that a car get better results in a mustandgyne than a dynojet???!!!

BigT

Dynojet dyno's don't have calibrations outside of SAE and STD correction which is prefixed into the dyno and based on the weather. (if they have a weather station connected to the dyno) Other dynos, like mustang, dyno dynamics, land and sea, etc. can be altered by the operator to inflate or deflate numbers. Most unaltered mustang dyno's read lower than dynojets. If I had to guess, the one you went on has been adjusted.