Originally posted by D Davis:
With the CAI, I think you'd be pulling more air w/out the e-ram than with. It looks to me like that thing is quite a spacehog inside that pipe. Also, if the air velocity in the CAI is xx and the maximum air velocity the e-ram can generate (yy) is less than xx, all you're doing is lowering air velocity and lowering total air volume.
I think you underestimate the e-RAM. The amount of air it will move through an open-ended pipe is around three times the Zetec's maximum consumption. If there were a way to fit it into your intake, I bet it would give you gains.