For what it's worth I tested K&N Filters years ago in a Toyota Tacoma vs. stock and AEM dry filters.
The only way I could think to test filtration ability was silicone content in the resulting oil analysis.
After 5,000 miles the K&N filter oil analysis had more silicone than either stock or AEM dry filter.
Tests were in the stock air box in that truck.
Driving conditions were the same in all tests as well.
Having said that, the difference wasn't HUGE at all, but there was a slight difference.
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