So i had a 'flute' type noise coming from my divert valve, its a standard 710n, bought it a few months ago from tps, just got a replacement, and it makes the exact same noise!!!! The noise occurs at between -5 - 0 boost. Its running around stage 1 atm, and im thinking that maybe its just not up to it? Although id have thought it wasnt up to it then it wouldn't hold boost at full throttle? Perhaps the noise is infact coming from somewhere else, but ive tried my old DV which has a dodgy valve (chatters) and that doesnt make the noise... Im confused! I need to try on a forge 007p or something i think. What do people think? Ever had the problem ive got?