Im about to swap EVO 3 ECU in my car. All pins match except the usual wastegate and fuel pressure solenoids.If someone has dealt with it please share: what are pins 54 and 57; Also what kind of O2 sensor /pin 56/ does it use - 1 wire O2 sensor, or the 4 wire sensor. In this matter, I dont see O2 sensor heater pins. Also, pin 6 is Secondary Air Solenoid - what does that mean? ON my ECU pinout pin 6 is the EGR - is it the same?

Thank you