Speaking of wanting a certain sound, heard this story years ago, and even if it isn't true, it is still amusing. This bloke walks into this mate of mine's workshop and says he has just fitted a BOV to his car, but it doesn't make the right sounds. So my mate the mechanice goes over, lifts the bonnet and has a quick look underneath, shuts the bonnet and walks back and says he knows why the BOV isn't sounding right. He says to the customer, "Well, to make it sound right first you have to fit a turbo to the car"!