Nice job.
What causes the negative spike at the end of each pulse? Motor inductance?
Edit: Watched a few more of your vids and was impressed.
For the K&N vs OEM air filter test, I would like to have seen another run with the OEM filter - this would show if engine internals (and other parts in the engine bay) warming had any effect. Going by fuel/oil/water temp data, the effect should be minimal but a third run with the OEM filter would "prove" it.