A link someone else posted up in last 24hrs has some other interesting international Subaru links
http://leoneturbo.com/
I have checked out one http://www.subaruclub.nl , found some intersting engineering in the EJ20G into a Vortex. Might just have to appreciate it for the pictures unless you read non English Germanic language better than most

Others to discover later above
Maybe if you know of other Subaru dedicated sites list them in here ??
http://www.subaruvortex.com is a bit quiet
http://www.subaruxt.com is reasonably active ...