The CAI DOES give you better throttle response! The extra noise, the knowledge that you have a new "mod" in your car (different means better, right?) all add up to more aggressive throttle response from your right foot. Anyone that says any different is just ignoring the facts.
Installed this Amazon intake on mine. Only cost $60 and sounds just how I wanted it to - like a power stroke lol. Primarily installed it for the sounds as it didn't increase mpg's at all and i'm sure its sucking in much hotter air. If you're interested in going this route, I made a video on the install and some before & after sounds. Hope this helps!! (Youtube: 'AJ LoDato')