if your putting a v7 jdm ej207 into a 2002 usdm wrx all you need to do is plug it all in. ECU will plug in and match up and the head connectors as well. The only difference is they add 8 wires (4 passenger side, 4 drivers side) for AVCS in the JDM cars. IAperformance sells a plug and play kit you just remove the pin blocks and install the wires running 4 from the passenger head pin block and 4 from the drivers one right to the ECU. they use all the same pin blocks just the USDM cars they left those spots for the AVCS empty. its about the easiest swap you can do.