Nicks Garage 383 build

If accuracy is what you are after, the Performance Trends makes a weather station and software that uses the observed numbers and the weather at the time of the dyno and compares those conditions and numbers with the weather at the track that day.

Then it gives you the actual power the engine is making on that day at that time.

Notice it doesn’t use corrected numbers. There’s a reason for that.
They are already correcting the numbers at the dyno based off the weather at the dyno. They can correct using whatever standard you want them to. The likely most accurate numbers will come from the correction factor that is closest to the weather conditions at the dyno and racetrack.