Don't waste your time with Hypertech for the Duramax. I have one and am not that impressed with it. I had your same opinion on it at first. Why spend more? The hypertech doesn't provide as much torque, no diagnostics, and it doesn't remove the speed limiter. Just my 2 cents worth. Have a Diablo coming soon and then I'll be saving up for some tranny work.
If you are looking at budget boxes, you might give the superchips a try. On GM gas trucks the superchip seems to provide more power than the hypertech. Go to www.pickuptruck.com and do search. You will find a lot of info concerning the two. Current all time favorite for the gassers is Wester's custom tuned PCM's.
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