My Turbine does not whistle if you do not suck it like EXTREMELY hard, in a way that "I WANT TO MAKE THIS WHISTLE!" And I want to make mine whistle so I am the crazy flute player. I always go hard. But as these Classic Turbines are not available anymore, I don't know about the new "Precision Turbines". If its a case of annoyed girlfriend and pets vs lost 150 bucks, why not just chip out the money if you are sure that then the problem is fixed?