if you want a good intake get a belt driven one
, they add more HP than any CAI (cold air intake) could ever dream of.
cold air intakes add very few hp for most new trucks as they aready have pretty free flowing systems from the factory now. but it will give you a touch more pep out of it and probaly a mpg or 2 more possibly 3mpg when paired with an exaust system.
if you really feel it needs a fair bit more HP its gonna take CAI, exaust, and a custom tune.
but honestly, you just got a wimpy motor. what kind of MPG does it get now?