[Wiisass]

Eliminating the tire/road contact won't help you actually see how well the car is making power. Dynopacks read higher because they eliminate the inertia of the wheels and tires. So if you just want high dyno readings then awesome, use one of them. But if you want to know what your car will actually do, then put it on a dynojet. power and torque don't mean anything if you can't put it down right. And with a dynopack you'll never know. You should also tune with the wheels and tires on there in order to better optimize the power curves with everything on the car that will be on the street. The dynopack would be awesome if you didn't need wheels and tires to drive around on the street.

Inertia and the tire/road contact are two things that are pretty important when driving a car on the street. So to me, it makes sense to use a dyno that takes these things into account. The closer your test conditions are to real world situations the better they will be.