The LXforums crew actually bought a bunch of CAIs and dyno tested them back to back.
End result, no gains to be had.
Please download the raw data and review it. The HP readings did not change but the A/F ratio showed drastic changes.
Before the test it was decided to reset the computer between runs. I believe this makes the computer default to a rich condition for safety. I don't know how to prove it.
I dynoed my car with the stock intake twice and then with no intake twice (the intake face off "open air" test) and got an 18hp gain.
my dyno results
notice my AF got leaner when I removed the intake. (I unhooked the intake tube from the throttle body) The Intake face-off got richer, so there is something else going on in the face-off test.
The Hemi runs too rich to begin with.
Having Magna Flow mufflers installed tomorrow on my Magnesium Pearl Charger R/T. Cutting the resonators off and running straight pipes from the mufflers. Gonna gain at least 15hp to 20hp. Next is the K&N Induction Kit for another 10hp to 20hp. Hoping to top out around 360 or 365HP.
I wish you had dynoed the car before So the after numbers would show you the gains.
If you dyno your car after ($85 dollars for Dyno should be about right)
Please post the results and make sure you specify the correction factor. My numbers where SAE adjusted.