Just a few, mostly related to after-run time and the PWM % for how the fans ramp on. It isnt enough to warrant me changing it on my personal truck with a 2 relay efan kit, but when I do my 3 relay fan harness swap and new fans I'll do it then. All of my customers get a tweaked version of PCMofNC's version, they're all running PCMofNC harnesses but I like to change a few on/off and after-run params.