This EJ205 also has the AVCS option to run For extra functionality. To operate the AVCS, the avcs harness and also the avcs ecu is necessary. Even so, That is optional, you don’t really need to run the avcs to produce the motor in shape in the 2002 to 2005 WRX. It's a direct lengthy block substitute for 2002 to 2005 Subaru WRX.As opposed to most