truth about air filters

[RedDiesel]

ISO 5011 Duramax Air Filter Test Report
Found this on another forum

 

[CHPMustang]

Thought I've seen that before

 

[JRJ04]

so it looks like k&n is a bunch of crap. being that this was over 3 years ago, do you think they have made any chages to their products to improve the quality?

 

[JLDickmon]

so I've said it before, and I'll say it again..
K&N Filters should only be used as a squirrel trap