I use a 3x17 round cake pan. Cut the bottom out and riveted to a 1 1/2" drop base open filter bottom. I had some extra window channel rubber to seal to the hood. K&N 14x4 and summit filter top. I have a 16" round hole in my hood and use a dual snorkel scoop.
Did you notice an improvement? I'm running the same scoop and have been thinking about it...well, I really wanna do it, just don't k own if its worth the while, or would choke performance