DOSNR33

Hey guys Just wanna know how to get my r33 gts-t dosing like a vl turbo. So far ive hooked up a front mount and just installed a bleed valve boost controller for abit more cheap boost(boost gauge showing 18psi) i heard the more boost the higher pitched the dose sounds are. im after more of a soooooootututu noise rather then a quik sututu. So wats the next step? any help appreciated..thnx