This EJ205 also has the AVCS choice to run for additional general performance. To run the AVCS, the avcs harness plus the avcs ecu is necessary. Nevertheless, This is certainly optional, you don’t need to run the avcs to make the motor suit in the 2002 to 2005 WRX. This is a immediate long block replacement for 2002 to 2005 Subaru WRX.What are th