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Hi all, I have been lurking a long time and gotten lots of good tips / info here. Thanks! I am a 'want-to-be' tuner of Duramax, I have done a LOT of basic work on LBZs, for friends / family / co-workers / strangers. I know a little and need to learn ten times more. I am currently trying to tune the DSP5 switches on both my step-dad's and my bosses LMM. Need lots of advice... Great to be here!!