We are just starting to ship the latest SDS EM-5 ECU now with EM56 board and V 25.7 software. The EM56 now has on board coil drivers for up to 4 channels (as opposed to add-on daughter boards in previous EM-4 and EM-5 ECUs) and an additional analog input for something like an oil temp sensor. Version 25.7 software has additional code to enable one programmer to access dual ECUs in aviation applications. Usable on most 4, 6 and 8 cylinder engines.