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Could be an air leak. Do you have a boost gauge? I know that whenever I have a leak, I "feel" or "hear" it first, then look to the boost gauge to look for changes in how it's "acting".
Could also be a high frequency vibration. Dipsticks like to wiggle when they're not in all the way.
It sounds like something to keep an ear on, but unless it changes pitch/volume/etc, don't worry too much about it.
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