What revision is this ECU ROM? Is it this the updated ECU that resolves the pinging issues with the 2004? Comparing this ECU with my friends 2004 STi USDM, there are some differences...
I would pick the "copy" option and pick another 04 STi ROM as a starting point. Then you only have to fill out a couple of bits of info that are different. Be sure to put in accurate info and post the ROM and the XML data you generate so I can add it to the library.