FJ60 makes whistling noise - exhaust leak?

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I’ve had a manifold exhaust leak and it didn’t sound amazing like that. Mine sounded like a mini exhaust pipe in the engine compartment.
That short clip of yours sounds to me like bearing squeal from one of the accessories.
 
Typical exhaust leak will sound like a low-Tick-Tick-Tick

Does sound like high-pitch bearing squeal, from something exposed, like an Alternator or Idler. Best to isolate with mechanics stethoscope

Easy to check is the A/C idler bearing, if you have A/C.


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The high pitched noise sounds like it could be an air intake leak. I had this happen when I didn’t torque my bolts down enough after I replaced the gaskets.

Does it get louder with acceleration?
 
I think I have tracked mine down to the gas filter on the intake having a vacuum leak. Gonna work on it this weekend.
 

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