i have predator for my truck and was reading on the website that you can program a custom tune into it. anyone done this and/ or know where i could look at some of the custom tunes that can be loaded with this tuner.

they are referring to a tuning shop writing the tunes and sending them to you in an email type file for you to upload or them installing the tune for you, I believe. I have had two of these trucks and both had predators along with an 01 lightning, an 03 cobra, and my current ls1 car. All have had predators on them so Im pretty familiar with how they work. I might, however, be wrong about what your asking...