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  1. $10k for upgrades...what to do?

    General Discussion
    I have $10k (+ or - a couple k) to spend on my 2007 GMC Sierra Classic 2500HD 4WD DMAX. I'm new to the whole diesel craze, and have been driving with a stock tranny & engine, and only running a Bully Dog Power Pup stacked with an Edge Juice W/ Attitude. I really want to do this truck right, so...