Dynos are simply a tool, some tools are better than others. No different than a flow bench, desk top dyno or whatever. One can tell when a car is an over achiever vs and under achiever. But certain things are pretty concrete. Like MPH and Weight, they dont lie as a true measure of HP. People chasing dyno numbers and flow numbers rarely have the fortitude to fully sort out their combos and are content to quote meaningless HP and flow numbers....