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  1. 11-16 LML Duramax Powertrain
    Hey everybody 2011 3500hd I have a very loud and obnoxious noise coming from the firewall area at the turbo. Starts around 1200rpm and almost changes frequencies when I’m driving. Even when the cruise is set, it’ll change from low to high back to low. Like a squeal/whistle. I thought for sure...
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