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  1. D

    New to the duramax.

    My son just bought his first duramax. It's a 2001 2500 hd automatic 4x4. Just got it out of shop having put a new transfer case in. Now we are looking to do motor upgrades. Looking at 6-700 horse but don't know where to start. Stock motor with 220 thousand on it as we /he is on a highschool...
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