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Are you able to hear it stoppped with the hood up?
 

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Ok, I was thinking it might be wind noise.
With the hood up you should be able to follow the sound and get close to the source. But you need an assistant.
 

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Hmmm might be the AC compressor, did you remove that belt?
 

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Do you have a throttle body spacer?, They will whistle.
 
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