CAT ECU calibration files
26 files for CAT engines, split into original (stock) files exactly as the manufacturer wrote them and mod files already modified from that original. Match by the number on the module — the ECM code, part number or software version.
The manufacturer's own calibration, exactly as it left the factory.
A calibration that has already been modified from the factory original.
Finding the right CAT file
Match by number, not by model. Two CAT trucks that look identical can carry different calibrations, so the ECM code, part number or software version printed on the module is what decides which file belongs in it. Every listing above shows that number, and the search box in the header searches those numbers directly.
Not sure where to read it off? The guides show where the number lives on Cummins, CAT and Detroit modules — and explain what an original file gives you that a modified one does not.