[AdamIsAdam]

These tests were done with the Cobra air cleaner in post #3. It's a 1.75" tall K&N. I cannot fit even another 1/4" taller with that oval filter because it's under the cowl and there is barely 1/4" clearance there. If I wanted taller I'd have to go 9" round and have it poke up into the hood scoop. But even then, as you can see, my engine is not centered in the car so it's very close to the edge of the scoop cutout.

But as I said, I saw NO decrease in HP with that filter in place (it actually went up, but I think that was just because it was the 3rd pull). And since I like the look of the oval vs round, I'll stick with what I have.

I guess it's large enough that it's allowing for enough CFM.