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Message: [QUOTE="6.7Bison, post: 1549475, member: 32432"] Did it run like a dog when it made the roaring sound? My best non professional guess would be related to turbo, intake piping, or exhaust. The CEL should tell you more. The sound could be a boost leak that opens up under higher boost pressures. The sound could be a rendition of the broken manifold stud squeal that appears under load. Either leak may have sealed up suddenly giving the impression that it runs like a bat out of hell compared to running like a dog before hand. Sudden change in feel of performance could be a problem with the vanes sticking in the vgt. Not sure that would cause a noise though. The sound could also have been the fan being stuck on but I don't think it would cause the performance change. [/QUOTE]

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