The new EM-4 is the latest evolution of our highly successful EM-1, EM-2 and EM-3 systems used in some of the fastest performance vehicles in 44 countries worldwide. The fourth generation system features improved digital, hard filtering and circuit protection, easier, more flexible programming, a noise resistant, single chip, ECU design and batch fired injectors for reliability and ease of hookup. Our systems are very popular when swapping engines without factory electronics into different chassis.