Racing BOV is basically an open BOV, so it's going to make a basic PSSSH sound. It's a racing BOV, which means it's not going to open on low boost (hard spring). It's not going make much in the way of "sounds" unless you are hitting really high boost , at which point a super loud PSH of air will be heard.
It's a serious BOV, and the people who buy it don't buy it for the sound.
If you want to be different, get the SS and take the insert out.
It's a serious BOV, and the people who buy it don't buy it for the sound.
If you want to be different, get the SS and take the insert out.