I've noticed minimal gains from almost all my minor bolt-on mods on their own...
They are all really just "supporting" mods and no single one produces more than a few ponies alone.
I recently Dyno'd my Ram and its actually lower than many stock Rams are posting LOL!
IMHO, Real "Performance" Gains come from:
Cams/Heads/Headers/Lower Gears/High Stall Torque Converters.
But they don't always work well together unless you start with the three basics. Intake/Exhaust/Tune.
Just pick one that looks pretty, sounds good and doesn't break the bank.
You really cant go wrong cuz ALL aftermarket CAI's still use the same sized stock limited fender opening.
A good read on that with Pic's and explanation here: