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I plan on doing the 6637, gauges, and DP in one day too! Which settings did you get? From the sounds of it I will be impressed. When you did your 6637 did you use a piece of pipe or just the rubber hose?
I had the bigger exhaust and the 6637 and a predator when I switched to the dp tuner and after a few minor issues that was resolved through here and conversations with jodie I still was saying wow the dp tuner is that much better then the predator IMHO