I know this question has been asked a lot but nothing really seems to be similar to what I am asking. My car is a 98GT with a 2000GT PI motor. It also has VT stage 1 cams, all the bolt-ons and will soon be adding a 100shot of nitrous. I am running the stock ECU (from the 98) and want to know which tuner will let me easily calibrate for new gears and tire diameters, as well as switch from mode to mode. Maybe something like having a fuel economy mode, a spirited driving mode, and an "all out" race mode for when using the nitrous. I have heard good things about the SCT Livewire but is it worth the extra money over the Xcal2? I already have a G-Tech and it has lost its luster so that feature on the Livewire is useless to me. What about the predator? Thanks guys