This EJ205 also has the AVCS option to operate for additional general performance. To run the AVCS, the avcs harness and the avcs ecu is needed. However, This really is optional, you don’t have to run the avcs to make the motor healthy within your 2002 to 2005 WRX. It's a immediate prolonged block alternative for 2002 to 2005 Subaru WRX.Consideri