This EJ205 also has the AVCS option to operate for additional overall performance. To operate the AVCS, the avcs harness as well as avcs ecu is necessary. Nonetheless, this is optional, you don’t need to operate the avcs to produce the motor healthy as part of your 2002 to 2005 WRX. This is a direct very long block substitution for 2002 to 2005 S