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turbo issue
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  1. Duramax Third Generation: 2006-2007.5 (LBZ & LLY)
    I noticed that my turbo doesn't have the whistle any more. Fuel mileage is about 17mpg on level ground at 70 mph. Turbo does create boost, no black smoke. I have a PPE 70hp tune in it, but it's been there a while so that hasn't changed. I cleaned the vane position sensor no change, going to...
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