I find it odd that no one messes with these cars, but they do with Legacies. Why is that?
you just haven't been around long enough.
I have seen multiple posts on the following;
how to raise my Outback
how to lower my outback
swapping in a different engine in my outback
swapping a different transmission into my outback
putting a rear LSD in my outback
putting a turbo engine in my outback
putting a supercharger in my outback
putting bigger brakes on my outback
putting better struts on my outback
putting heavier anti-roll bars on my outback
putting better lighting on my outback
putting bigger rims on my outback
putting a metal skid plate on my outback
putting huge light bars with mega-lighting on my outback
many other more minor mods
(you might enjoy reading at ultimatesubaru.org and at NASIOC for mod ideas too)
But the intake and exhaust systems on the NA motors don't present much opportunity for noticeable increases in power.