Dynapack. One of the best dynameters IMO.

http://www.dynapackusa.com/

The reading on the dynapack says flywheel, but its at the axle/wheel. Its not flywheel horsepower, its wheel Jeff's Dynapack reads about the same as Dyno Jets in his area. He has tested three different cars including his own. He configured his auto plot ramp times, leaving SAE correction factor enabled and not messing with the TCF which would give him flywheel rating if he entered a correction factor for drivetrain loss which he leaves at 1.00.

Here is his car on a Dyno Jet.


Here is his car on his Dyna Pack the SAME day with no changes.