The Amsoil videos are certainly good quality... but they lack a lot of detail.
For example how small are the particles that are filtered?
What filters did they compare themselves with?
I've actually tried to buy Amsoil filters continuously over the years... but every time I try it turns out they don't have a filter to suit my car. Amsoil is mainly an American company and does not have filters for many of the cars on the Australian market.
My latest attempt was the Mitsubishi Colt... no filter. I think the Toyota Yaris also didn't have an available filter. My local foam filter manufacturer got me to send in a filter and is making one up for the Yaris (should have that soon) and has also worked with me to find a solution for the Colt (still working on that). Amsoil has never been this responsive.
Don't confuse home brew testing with bad testing.
Some home brew testing is pointless or misleading... but not all.
Figuring out how to test for key performance indicators at home is often just a matter of using your brains and understanding what is being tested. What the tests show is exactly what I've seen over about 4 million kms with various filters... I don't think the tests are fudged. I can't get dirt to go through a good foam filter.
I always wondered why Amsoil stopped using foam filters... but figured that one reason was that you sold one... and you never sold another... because they lasted the life of the vehicle.
Nanofibres require regular changes of air filter.
Given that my favoured foam air filter manufacturer seems to be able to match the flow characteristics of my standard filter... and better them by ~24%... suggests that there is no problem improving flow with foam.
None of the tests so far compare foam to nanofibre.
The motorbikes I ride have a reputation for failing rapidly if they use standard filters in the desert because they load up and then the engine fails.
Foam never fully loads up... as the dust simply falls to the bottom of the air box and the filter continues to breathe (in fact in 600kms of outback roads the filter carrying capacity seemed barely affected).
In the middle of a desert you can't just stop and change air filters... plus you probably wouldn't know when to change them.
One thing nobody ever tests is old filters... Unifilter surprised me by sending my filters off to japan for testing. They found the Toyota Yaris was letting through particles 60 microns in size... and the Mitsubishi Colt was letting through particles 130 microns in size. Both of these were used filters... which suggests that testing when new is not the same as testing when old.
BTW: Mitsubishi would not take a look at the filter in question... and is simply in denial NB. Filtration should be about 40 microns on a normal air filter... so it's interesting to see these claims of filtration up to 2 microns or better... and I wonder how an older filter would perform. Mitsubishi also couldn't provide an official filter spec for their filters... so we have no idea what standard they claim to be filtering to. Doubly annoying was their attitude... they told me if there was dirt in the filter then the filter was doing it's job.