I have a 94 2500, mild modded 454, 4l80e. PCM is 6395 and 7427, they both seem to work the same. If your motor is only minor modded l would just stick with the gm setup. I did a bunch of data logging and chip burning. Mostly experimenting to learn how it works. The last couple of years I have done nothing to computer and it has been reliable, reliable. It pulls a trailer way better than stock. Runs much smoother than when I got it stock.