Style chooser

hi,

i would like to ask wether BOV can produce pss sound on 1 to 3 psi or at 0.1 and 0.2 bar? if possible, what type bov u guys recommended - and as for me, i need a pull type bov instead of push type as u can see only 0.2 bar has been boosted.. actually i manage to close the bov at idle, but i just wanna ask about this cool sound appearance, wether they got or not at 0.1 or 0.2 bar? or it just a flutter?

ps - sorry for my dumbness