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I think it's normal too. I've had mine checked and all clear. My n54 135 never made as much whistle under light throttle inputs, but I was told as this n54 has overboost, the turbo whistles a little more (??). It can be really loud, grown to like it more and more. Would love to hear what it sounds like to someone on the sidewalk. Stop worrying and enjoy the turbo sounds! As long as it boosts okay...
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