The PC III EX offers virtually the same tuning functionality as the “race only Power Commander line, while at the same time complying with the California ARB regulations (E.O No. D-619). The PC III EX is compatible with Tuning Link Software. Custom maps can be developed in much the same way as the “race only version. Maps made for the “race only PC III can be loaded into the PC III EX and are automatically converted to the proper format.