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This EJ205 also has the AVCS choice to run For extra performance. To run the AVCS, the avcs harness as well as avcs ecu is required. On the other hand, This can be optional, you don’t really have to run the avcs to produce the motor in good shape inside your 2002 to 2005 WRX. This is a direct prolonged block substitute for 2002 to 2005 Subaru WRX