Makes sense. Good to know. I appreciate the info and reply.I get it all the time, I usually just have my music loud enough to never hear it. I assume that the noise comes from the path the air takes going through the brakes and through the wheel. I assume that because it gets louder when close to some object on the side (curb, car, wall, etc.). This can be possibly disproven with steel wheels, as, it seems to me, most people with drilled and slotted rotors also have alloys.