welcome to the club
a CAI is for cool factor and noise but it also gives you gains. although slight they are noticed. in my opinion its best to do a CAI with a cat back to get the beast breathing the way it should. u cant just breath in and not let it all out as fast as it went in now can u?
do those and add a nelson tune and u will have a ear to ear grin everytime u get behind the wheel.
debadge - this was first for me makes her go faster
paint the bow tie, smoothes the front end. again making her go faster
paint brake lights - luv this on my 04, see above
dura stop brakes with gmt 900 fronts (upto 06) - this is a must on our trucks
ambers - this was my second
Cat back - my third
CAI - my forth
Programmer or tune - this i just did (nelson tune). my only regret was not doing it years ago
there are tons of cheap little things u can do
simple things like
adding kick lights, change out all the lights to led (interior), add a light in the glove box
this list can be huge. start small and work ur way up. this way u get to know the truck inside and out. also please keep in mind, if u want to go fast u need to be able to stop her just as fast. upgrading the brakes is more important that going fast in my opinion on a 6000lb truck
gl and keep us posted
Dan