you're BOV is proably loose. Tighten the bolts down some more, and make sure the flange isn't warped. Check all the vacuum hoses, and clamps as well.
Also, yes the tear can cause a howl. I forgot to tighten a hose clamp (I know, I know) by the turbo, and when the car built boost, it howled REALLY loudly. Put duct tape over the hose, and see if it stops. Duct tape should hold untill you can get a new hose.