Hi mate, just wanted to share my past experience when it come to CAI.
I too own a 4AGE Smallport and found that the best CAI for it is the stock airbox with ducting going through the
bottom hole, into the guard.. Although before this is achieved, there is a big 'anti-drone' box in that near side guard that has to be removed.
I've tried using a pod filter instead of the airbox (still with a cold air feed) and i feel as if it doesn't compare to stock, the only gains
would have to be the 'Sound of Intake' lol. :) I hope this this helps, Good luck with you car