Here's the thing, nobody seems to advertise this stuff with any real validity. If something comes with a cfm rating, that is only valid if it comes with a pressure drop number. Because lets face it, I can flow Niagra Falls through a straw, but if I don't know what the pressure drop is, I don't know what kind of cost is involved to get it through.
I believe SB, KN, AMSOIL, and many others, all have ISO tests for them saying that it "flows better".. That means for the same cfm, there is less pressure drop...and that is true...those claims are generally good. BUT ONLY when the element is new. Ever here of these companies report on the pressure drop after 5000 miles of driving? You won't, and the reason is because THEY SUCK compared to the oem at that point. Mainly because of this surface area difference. Since I'm inherently lazy, I KNOW I am not going to be a slave to my element every 5K. And from testing, I know my maintenance-void oem element is not only the most intelligent choice (for me), but it is still good even after 20K.
Add to the reality, these alternatives are downright ugly when you look at how much dirt they let by, under realistic, non-lab conditions. As much as 100x more dirt. No joke.
Nothing, and I mean nothing, competes with the longevity and dirt protection of this element. I've tested them all.
I have no problem with anyone running whatever they want, for noise, or whatever reason. I'm an old geek, I like relative quiet, that's just me for better or worse. The intake wasn't added for noise, it was to protect the motor and turbo,
FWIW
JMO
Back to pressure drop and cfm rating. These things range from 3 iwc to 5 iwc of pressure drop at stock air flow levels. Do I care about that disparity? Hell no, that is only 0.1 psi! I have over 4 psi of restriction in the mouthpiece to worry about.