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  1. New Duramax owner from California

    Introductions
    Howdy, new 6.6 2500HD owner from California, behind enemy lines! I'm anxious to learn what I can do to increase performance here in this state while remaining "legal" for the emissions sniffers, aka Tailpipe Nazis. I got my 2015 used about 6 months ago. It has 94k miles and just started...
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