From the rear of the car you can see that it is harnessed at all four corners and the dyno rollers are just beginning to spin at the start of a dyno run.
Dave at EFX Tuning is using the HP Tuner software to make adjustments to the PCM parameters between dyno runs to achieve the optimal settings for everything. Over 5 hours of testing, adjusting and retesting resulted in the best performance the car could give us.