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since stock is 394 hp, how can you claim 100 hp increase with only 416 hp peak shown on your dyno chart?
The 396hp you are referring to is CRANK (flywheel) horsepower. The chart above is a chassis dynamometer chart which shows power "at the wheels". The 416hp is "wheel" horsepower.
If you add the drivetrain loss to the 416hp (power at the wheels) you will see the vehicle is making over 500+hp at the engine/crank (flywheel).
You can see the power gain on the POWER PLOT posted above as we did a before and after. The vehicle's 394hp at the CRANK measured 318hp at the WHEELS on our dynamometer (dyno)