I got the "1725" and it's fairly easy to use. I have a 5 speed so my mods were to the rev limiter, speed limiter and of course, the hipo setting (timing). I have stock gears but I can tell you that when I made my mods it was a significant difference in the launch and accelaration... I couldn't believe it when I went for my first "test drive" and broke the wheels loose from a rolling start without having it floored. This is one of my favorite mods. I like that I can crank it down to the stock settings whenever I take it in to the dealer.