I'm looking for a resource that explains what the different serial numbers/brands mean between various subaru models. I'm about to put a 02 WRX 5-speed in my 05 outback sport (4eat) and was thinking about trying to run a 05 manual outback sport ecu to cut down on additional wiring issues. I've been looking over on Nasioc and scoobynet.com for anwsers but haven't found any useful info. I think 05 they must have switched to Denzo Ecu's but that's about all i have been able to figure. some i found on ebay: hitachi Ah522 http://www.ebay.com/itm/04-SUBARU-I...ash=item1c49ec2e6e:g:7QIAAOSwofxUdYEs&vxp=mtr Hitachi AH522 http://www.ebay.com/itm/2004-SUBARU...ash=item41a643bde6:g:Pz8AAOSwgQ9VjJT3&vxp=mtr Denzo http://www.ebay.com/itm/05-SUBARU-I...ash=item5d5cfce8dd:g:pNIAAOSwgNRV7zCI&vxp=mtr Denzo http://www.ebay.com/itm/05-IMPREZA-...ash=item51e10bdde5:g:lvoAAOSwzgRW12zt&vxp=mtr