CAI's are about the most popular mod around these parts. Combined with an aftercat exhaust, they really open this truck up. Some go with headers, hi-flo cats, etc... Others just go the drop-in filter route. It's basically up to the individual.
I'm sure you'll get lots of different answers, but be sure to look around. There are lots of threads about CAI's on here with tons of info!
i have the brute force chrome intake and love it.........it gave me fast acceleration and it's loud. u can hear it suck allot of air. and the chrome tub is loud to kinda like havin a second exhaust under ur hood!!