The claim that snorkeling is counterproductive is somewhat controversial...
http://986forum.com/forums/performance-technical-chat/9671-finally-dyno-charts-de-snorked-986s.html
I can't find the link to the thread at the moment, but Jake even touts the desnorkling of a 2.5l boxster spec car.
Take caution before it's know-all end all.
~~~ It's also true that our car stock has a cold air intake- albeit a rather inefficient one. I did not believe it was that bad until I actually saw the maze with my own eyes. Don't except a massive jump rocket in horsepower, but you would indubitably free some horsepower up.