Whistling during throttle.

Stopped mine in my 20' Tundra. Just simply cut the mesh screen out of the gasket and reinstalled. Took all of 15 minutes. Interestingly, my wife's 21' Sequoia doesnt have the whistle

 

It ended up being my mass airflow sensor, I cleaned with maf sensor cleaner and it went away so far.

 

Interesting, I'll need to look at this... I never had the whistle, until my supercharger kit was installed, which comes with a different Throttle Body gasket, which is open. My dog whistle sound is typically heard only under load at low RPM. Like when I start going up a hill and stay at neutral throttle. No, it's not the supercharger whine. This is a super high pitch whistle that comes on at the exact same strech of hill climb every day on my way home from work.

 

Interesting. If I drive around 55 with windows closed and no ac and road is quiet, I hearthstone exact very faint whine or whistle everyone here is describing. 4.6v8. It goes away if I let go of throttle and if I feather it to gently accelerate(very gently), I hear it.