I just installed an s&b CAI and it sounds incredible! The truck sounds mean as hell in the cab when you put it above 3000 rpm. Also not sure on throttle response.. It felt good before, and feels very good now but I never timed it or anything so I'm wondering if its just my head wanting it to be more responsive.
I'm not expecting a fuel mileage gain, but ill watch for it anyways.
Install was a pain in the ass and took longer then expected. I wish it was easier to remove the wheel fender, I only moved it as much as I could and it was the reason the install went longer.
So far I am happy with the sound and performance and hope it only gets better from here. This is the first of many money sucking ideas I have!