Sorry to necropost, but I was inspired by this mod and attempted my own, mainly because none of the lictures on the OP worked for me...
Anyway, I took my handy dremel and opened up the bottom flat section of the intake, so it only added maybe a 3x3" area. After a quick test drive it seems to have helped with my low idle, but I'll drive it more to make sure. I'll widen the hole in the future if I feel like it's a good move.
Posted for another spin on a great (and cheap) mod.
Edit: I left the original intake part that goes up to the front of the hood on just for redundancy purposes.
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