Since radar detectors and car audio seem to go hand-in-hand, I thought that I would add a few links to some Subaru-oriented radar detector installs, either standalone pages or forum threads.
Enjoy!
http://www.bikes-n-spikes.org/sti/v1/v1.html
http://forums.nasioc.com/forums/showthread.php?t=2458253
http://forums.nasioc.com/forums/showthread.php?t=2463409
http://www.iwsti.com/forums/how-install/16651-v1-install-05-a.html
http://sl-i.net/FORUM/viewtopic.php?f=39&t=21822
http://legacygt.com/forums/showthread.php/easy-radar-detector-install-45289.html
http://legacygt.com/forums/showthread.php/escort-radar-detector-remote-flush-mount-5eat-11100.html
http://www.ft86club.com/forums/showthread.php?t=37549
http://www.ft86club.com/forums/showthread.php?t=21171
A few there for the Impreza / WRX/ STi guys, Legacy, BRZ / GT86 / FR-S crowd. I did not find much for the Forester but the concept is the same. If you know of a good Forester install, drop me a line and I will add it here.