The CAI has no known increase in HP or torque. I will be honest and that I have an intake, but I don't think it made a difference in performance. Dyno your car before and after the intake to see if it makes a difference.
The chip would do more for you, by increasing RPM, removing the limiter and changing the air/fuel ratio. As for the intake manifold, I have heard various rumors that it can help or it may not. I know for my car, to replace the intake manifold with one that increases the airflow is so labor intensive that the HP and torque gains are not worth doing it. I guess to each his own.