My old stock air intake vs. new AFE CAI intake I installed the other day.
It was relatively easy to install plus I am not skilled on working on cars at all yet. The price is kind of expensive, but I received it as a gift and the quality seems great. It came with a Pro Dry S filter which is super easy to clean either by shaking or vacuum and it never needs to be oiled. The AFE CAI is much louder than the stock when you stomp on it, but if you don't they sound about the same. I am getting slightly better mpg maybe 1mpg better and as far as performance maybe a few extra ponies. Overall as a gift I love it, but I probably wouldn't pay for one myself.