I have the same whistling for about 30 seconds to a minute specially if I give it throttle and then it'll go away when it warms up. My gasket/seal is wore out where the air hat sits on my t. body and I'm waiting to get one from k and n

 

It was cold this morning. I had a whistle still untill the truck got to about 130 degrees this morning. not sure.... air hat seems to be secure on the TB not noticing any other holes.