The Link WRXLink WRX104X ECU is a direct plug in standalone ECU designed for 2004 to 2007 Subaru WRX models equipped with the EJ25 engine and manual transmission. This ECU installs using the factory wiring harness, making it an ideal upgrade for tuners seeking full control over fuel, ignition timing, boost control, and advanced motorsport strategies without converting to a full wire in ECU system.
