If the car’s battery were to die or be removed, then the ECU will be reset and that will wipe out any changes made by a Realtime tune. The same would apply if a scan tool or dealer service equipment was used to clear codes or manually reset an ECU. Subaru ECUs. Free yourself from the constraints of the factory ECU with Link Plugin ECUs to suit all popular Subaru vehicles such as the WRX / STI. Subarus are our ancestral roots going right back to our PossumLink venture with the legendary Possum Bourne in the early 1990s, when he dominated the rally scene in Australia and NZ, initially in the larger Legacy RS and then the WRXs and took many wins in the Asia/Pacific series.