There are a lot of sites about how to tune your car;
I'm simply documenting what I did to tune my car here.
I hope that it is useful to someone.
Using openecu, ecuflash, romraider, tactrix openport 2.0
Notes:
open romraider and select what you want to log
if you use RPM to enable the logging, you have to have 'rpm' checked in the config of romraider
save that profile as an xml
go to http://subaru.hunterjm.com/# and create a cfg file with the xml profile (you will also need your CPU ID)
Put the file that comes out on the root of the sd card.