AEM Electronics EMS-4 universal engine management systems provide complete engine control for maximum power and reliability. If your 4-cylinder powersports modifications have taken it beyond the factory ECU control, or your race vehicle doesn't need all of the advanced hardware features of AEM Series 2 systems, then these EMS-4 systems are the perfect choice for universal stand-alone engine management. They offer all of the advanced features of the powerful Series 2 hardware, minus unneeded ancillary components. These 36-pin connector units are designed to handle the toughest environments. They are completely sealed and weather/shockproof, so you can mount them anywhere. These management systems utilize AEM Tuner interface software, work with MAG or HALL crank inputs, and can directly drive smart coils or an external ignitor. Plus, they are fully enabled and unlocked, so you never pay for upgrades. Complete control of your smaller 4-cylinder engine comes in compact EMS-4 systems from AEM.