Unit, as far as just getting actual HP numbers, I wholeheartedly agree with you, but I can see the value of adding load. I can see where the rate at which an engine can accelerate does matter. If the car is spinning a drum that weighs less than itself, the engine will go through the RPM range too fast and not accurately simulate the velocity of exhaust gases and such.
If DynoJet has an option for that, great, but I think the Mustang Dynos come with it standard. The only place that I could find in our area that has a DynoJet and will work on Mustangs doesn't even have a wideband O2 sensor to integrate with the Dyno.
------------------
351W 89 Mustang GT Convertible