Much of the change I notice is on throttle response - the power change is nice but not as marked.
I can feel a significant difference taking out the charcole filter (as you noted, it is just for emissions).
I can plug up the holes extra hole dremeled into the intake, but I can't feel a difference with that. From an engineering perspective, more cold air is a good thing, I just can't feel it. Maybe it would make more difference with an exhaust (its in the mail).
If you plug up the Dinan CAI, do you notice a loss in power?
(good looking car!)