The code is on the computer, in big bold letters (not the little ones). The computer is above the passenger footwell, kind of tucked behind the carpet, and toward the right side of the car. I had to take mine out of the bracket, as the label was obscured.
Once you know your code, come back here and search the forum for that code. You may find someone else who has it, and they can tell you their experiences.
AFAIK, you should be fine on a stock chip with modest intake and exhaust mods that you list. If you plan to do more, I'd wait and get a custom burn. That's the advice I've heard/seen/read many times before.
For more info, search this forum for "superchip."
HTH.