There are two things I like about the AEM:
1. It keeps the box fairly sealed.
2. The are at least "somewhat" honest in their data. Has anyone ever actualy "looked" at the data for CAI's on Wrangler's?
Here is their published dyno chart.....loook at where the RPM's start.
And while I'm not to sure about the 14HP (maybe)....at least they are honest about WHEN
the gains occour.
Our sealed airbox intake system added outstanding gains from 4000 to 5500 RPM culminating in peak gains at an estimated 14 horsepower at 5,750 RPM and an additional 13 lb-ft of torque at 5,550 RPM. The increase in performance offered by part number 21-8316DS can prove useful in a variety of situations, whether it's merging onto a highway, towing a trailer, or off course rock climbing in your Jeep Wrangler.
Below 4000 rpms, you are basically gaining nothing.
A CAI is up to the owner....but if you don't spend a lot of time above 4000 rpms, you are not gaining much except looks and sound.
If I were to ever get a CAI, it would probably be something like the AEM. Outside of warrenty issues (which is why I won't get one), my number one concern is making sure I don't do anything that would increase the risk of hydrolock. But I'd also go in understanding that the only thing it will probably help is when I'm above 4000 rpms, and the only time I'm above 4000 rpm's is when I'm doing 0-60 tests.