Sound from Turbo

Friends, Some Turbocharged Vehicles have very little whistling sounds from the Turbos 3000 3000 cycles ... Just like the link I mentioned below, just do not close the sound recording image.

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I have seen a car with this whistle sound much stronger. The sound of the whistle that you know comes from this turbo.

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So Why Is It So Much Too Much To Get Too Much To Stroke A Stroke Down In One And Another?

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I expect you to enlighten me with the answers you give. Thank you in advance ...

Frankly, I did not hear any sound that came down, I felt like it was normal. But every time you press the gas, it seems like a balance sounds .. & nbsp;