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Ok I don't have my "Kennedy Boost Valve" installed yet ( still in the mail coming ), but under acceleration I can hear the turbo spoolup and then at a higher RPM it spools even higher then it goes silent but I'm still accelerating , is this the wastegate opening and relieveing the boost pressure on the turbo , or is it spinning so fast it just goes silent ? I really notice this since I installed my MAC intake with AFE cone filter.
 

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When I installed the intake on my truck I noteced more turbo noise. Its because that plastic piece that has the 6.6 Duramax on it is an intake muffler. The sound that yours is making sounds normal to me. Mine will go silent when I am full throttle.
 
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