just been messin round wit my dump valve today. i disconected it and luved the chatter was wonderin is der any way i could set it up so that the dump valve only opens on high boost. and chatters on low boost say up to 10 psi or so? like a stronger spring or something... also wondering my friend has the same dumpvalve and ther is a small screw in the back of it and it missing on mine...is that screw for adjusting the sound or what?