Funny you bring up the issue of the flutter, mine has always been obvious, more so n my car than others (I think), after reading this article I decided to check if I have a K an N filter. Ive had the car a few months and never checked, so about time I did. And found a 6 inch round hole in the front of the airbox!!!!!! guess im not getting a fpv snorkle hey lol, if u like the flutter noise break out the hole saw