Guys, he said the Mustang dyno had ventilation and the Dynojet didn't. That's all you need to hear.
OP- Any shop running your car on a dyno without proper cooling fans in place probably isn't a shop you should be doing business with. Putting your car under that kind of load without ample cooling fans being present can be very bad for the engine. Coolant temps can sky rocket with just the tiny (comparatively) on-board fans to pull air through the radiator.
They (the on-board fans) are intended to keep the car cool at idle, sitting in traffic, and to augment the normal airflow through the bumper at speed, not to cool the car under 100% load while standing still.
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