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  1. LBZ 4” Straight Pipe tuning question

    Duramax Third Generation: 2006-2007.5 (LBZ & LLY)
    New to site, I have 2006 LBZ all stock and am looking to install a 4” straight pipe. Called diesel performance shop and they told me I would need a tune on the truck otherwise I would go into limp mode. I have never heard that before. Any help would be appreciated.
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