I didn't see this mentioned before; Dynapacks measure from the hub. They completely eliminate the weight from the wheels and tires, which sap a lot of horsepower. This is why a lighter, smaller diameter wheel will push better numbers when compared to a heavier, larger diameter wheel when performed on a Dynojet/Mustang dyno, which includes the wheels. If even more of the mass is centered versus being closer to the barrel, you'd "unlock" even more wheel horse/torque.
Does that mean that a dyno with rollers is a more accurate depiction of the car's actual wheel hp/torque numbers? I would suppose so.
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"Since one of my brake light bulbs just went out, the forum told me that my piston rings are about to blow."
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