I think that the statement: "K&N flows more air" is truthful. (and maybe a little more dirt too) But like he said, the throttle body can only flow so much air. If you want/need more air to the engine, you must replace the throttle body with a larger one.Interesting there is an engineering guy that did tests on stock versus kn filter and on 154 hp and gained something like 4 hp with kn filter and 4 false torque
And then, if you're puting more air into a motor, getting it out is just as important. That's where the entire exhaust system come into play.
So, the HP/TQ claims might be absolutely truthful, but not the entire story.