Great comparison chart, a number of good filters. I ordered the WIX 46213.
The only negative to this test is the style of filter which was being tested.
To be clear, being this was a GM Truck air filter comparison, the filters being tested were of a cylindrical style vs the flat panel which we use.
However, I can see no reason why a manufacturer would use a different filter media for a flat panel vs a cylindrical filter, so the results should be pretty close to identical.
In addition, the author of this test made it clear "The 5µm spherical aluminum powder used in this test is a VERY fine powder, and was used to try and simulate a ‘worst case scenario
’ to get a better differentiation between the performances of each filter.
Obviously, with even a slightly larger particulate, the results of this test would have the filters performing more evenly.
Lastly, the author of this article was clear in stating;
"My conclusion with regards to airflow is that choosing a filter type or style for ‘more flow’ for either performance, or fuel mileage, is useless. The benefits of simply changing from a dirty filter, to a clean one, will give more benefit, than just changing from one filter style to another."