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before anyone says 'turbos make a whistling sound' its not that :D

2 days ago it started making a sound that is similar to the sound of blowing over the top of an empty beer bottle. it happens at around 2300rpm to 2800.

i've never heard a car make this noise before i cant seem to find it. i spose it could be a vac/exhaust leak..?

sound familiar to anyone?

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https://www.sau.com.au/forums/topic/32626-weird-whistling-sound/
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yeah i agree with bobjones.

the screw on my bov was overthreaded and allowed a slight boost leak thru the gasket, made the noise you are talking about, (blowing over beer bottle), but did it all the way thru the revrange when on boost.

i fixed it up, by re-tapping the screw hole, thus making the bov sit tighter and fixing the leak thru the gasket at that point.

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