"I wanted some opinions on the BOV's available for our car"
But like I was saying you can just search for the sound clips. They will sound the same on the Z as the do on other cars the only difference is you have 2. The mane determining factors in sound are boost level and the valve destine the engine has very little to do with sound they produce. You also have options with the HKS BOV's with replacing the inserts for different sound's