thats ideally what i want with my BOV. I have a HKS BOV, that is adjustable, but no chatter at all. when i adjust the screw, not alot changes. its not a HKS 2, looks smoother a slightly bigger? is it a possiblilty its worn out the spring? really want the high pitched 'chirp' of a HKS but its no where near that, really deep sound cheers