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307 2.0l hdi 90 whistling noise between 2k - 3k revs the car whistles all gears
take your foot off the gas the whistling stops....
anyone know what it could be
 

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Split/dislodged/loose pipe allowing you to hear the turbo spinning Id wager.
Had it on my 407,the pipe going to the airbox was not tightened up.Lack of proper boost till 2/2.5k and lots of turbo noise.
 
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