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I also ordered a Predator. I'm a little skeptic about fooling with the original settings but wanted to see how much difference it would make. Let me know how easy it was setting up your truck. I should get mine the 8th.
I am also skeptical, but figured it was worth a shot, since even the freaking gas pedal is an input to the PCM. I also will like the ability for speedo changes and OBDII code scanning (hope I dont need that one too much).
I bought one soon after buying my truck. It is the first and only mod I've done so far.
There is a HUGE difference over the stock settings. And I am only running the 87 (or is it 89) octane program.
I think most of the difference is from the torque modulation settings. The stock truck settings hold back power to make the truck smoother at take off. The Diablo settings do away with this.