i have a few bov questions. i noticed mine was making a real whistling noise when i barely reved the motor, so i tightened the nut on top of it down to get it to stop and i started wondering what the adjusment was really for. does anyone know if there are any advantages to adjusing your bov one way or the other, and for that matter what are the sound differences when you tighten down the nut as opposed to loosening it up?? i'm guessing tightening the nut acually tightens the tension on the valve makeing it harder for it to open, right? what does all that do to sound and performance, anything?