Quote Originally Posted by caloyski5 View Post
i had a lot of cone type filters used in my familia. (a number of simota, KNN, and even weapon R) i found the KNN had the best filtration and performance. all of them made the growling sound at mid-high rpm and the noticeable hiss at idle to low rpm. after 5 years of buying and selling, i decided to stick to stock. not because of the lack of performance (better throttle response and breathing) and porma but because i decided to focus more on my audio system more.
how were you able to prove that to yourself???