Originally Posted by Freon
As far as I can tell, this is the "ping fix"
Basically they just cut out 1 degree of timing from the higher load areas in the base ignition map. If you have a 2004 STI, you can just load the last 2004 STI ECU calibration (AJ243, A2ZS710J) with Openecu tools.
Did you do that gif up yourself? There should be more posters like you...