ok this is what you do... make sure to get plates that say "rice" then run over nails and it'll make that very same pshhh noise... then continue driving... the rims will make that squeek noise.. with an extra nausiating scraping sound plus lots of sparks... that sounds fun right? anyways... BOV's are a worthless waste of money other than just a pshhh sound... they pretty much do nothing and there is always something better you could be spending your money on in your z other than that $500 pshh noise. unless that is, your car is COMPLETELY modded and there is NOTHING else you can do... which is practically impossible.