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Turbo whistling - air valve ??
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Loud turbo whistle at high boost on a TD04 : r/abarth
Does anyone have experience with this engine "whistle" sound? - BMW M3 Forum (E90 E92)
2005 F350 6.0 - loud under hood whistle from turbo, maybe a leak? Truck blows black smoke under load and lacking power. Also not the same sound my '03 Excursion makes at idle. : r/FordDiesels
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Why does my car whistle at start up? - Quora
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