Probably your turbo.
No kidding that's exactly what my 86 Toyota 4X4 Turbo sounded like in the radio! LOL!Probably your turbo.
Nah, it's coming from the side and raises and lowers with the rpms.Could it be from the front axle? I mean from wind running across the hole on the right side when the hole is oriented upright instead if horizontal to the ground. Like a whistle.