Cold Air Intake
There are a few things fighting against getting more air in to increase performance. There is the AIT sensor which measures the intake temperature and then the MAP sensor which measures the pressure in the manifold. Then the PCM determines the trim on the throttle body. About the only place you really find some help is at WOT, and as stated to truly benefit a programmer and exhaust upgrade are needed.
I also installed one on my wife's 08 Sahara. I did not say anything to her about it. She asked me a week later what I had done to her Jeep to make it have more pickup and go. (that was a blind test.)
For $200 each, they were pricey, but they eliminate the need to buy filters and they do filter our desert dust better than paper filters. OEM air filters do NOT catch all the desert dust. Airaid filters do a much better job at protecting the engine out here
K&N advertises 10 or 11
Those sound like pretty substantial increases and the cost per hp increased is fairly cheap.
Go with the AFE drop in and the snorkel, better flow,, the way I see it, the faster I go the more air that is forced in the air ram, therefore, the bottleneck is eliminated at higher speeds.(Or when you are facing into the wind




