Grandsportgodzilla

Hey guys I have a 2012 GS with an a and a supercharger kit and here recently I have noticed that when i let out the BOV is whistling now instead of the typical supercharger noise it was making before. I have ordered a big red procharger by pass valve so if the BOV is going bad i guess that takes care of that, i just wanted to see if anyone else has experienced this and what was the cause, i also have a belt squeaking but that is getting replaced next week as well.