I have the same snorkus instructions on my site, with some more detail and part numbers. http://www.remarcable.net/misc/legacy_outback/
Those photos are by Juice on his forester, and as I found out today there are a few things different between the forester and legacy snorkuses (snorki?). Nothing really major though and those instructions will serve you pretty well.
I did the snorkusectomy today and now I have a very nice growl while giving it gas, and it revs to redline much faster.