Cobb Tuning out of Utah.
http://cobbtuning.com/legacy/
I have some of their products and have been extremely satisfied with their Customer service and support for my WRX. I am thinking of getting their Stage 2 Power Package as a matter of fact (283 HP). They offer parts for Legacy's.
Hope this helps. THere is a forum there, but its not quite as good as NABISCO.
Bill