I just did mine today! Took me about an hour and a half because I am very tedious and decided to tidy up some loose wiring.
Also removing the old filter box and the half hose connected to the snorkle was a little pain in the butt. But all in all a very simple mod, anyone with a regular tool kit and patience should be into some nice power real easy. :)
Filter just above air dam.
Picture from top shows nothing! :)
I used the K&N RU-3130, at first noticing there was some slight difference in the diameter of the tube to the filter I was worried. But that sucker is tight as hell on there without much work. I didn't tighten it up too much as I read there is a tendency to crack the tube.
So, if anyone else is looking into doing this. Do eeet!