Originally Posted by rsg1963
If the truck is new to you, give it a few months to get the feel for it otherwise any mods will not be as noticable IMHO.
4" exhaust is factory BTW for that year, mine is the same. I added a PacBrake, Banks after-cat Monster exhaust, Banks CAI, Banks Moster RAM intake. No tuner yet. I'd say the tuner is where you should start if you really aren't towing anything yet (a Rzr does not count, too small! ;-)) All the adds I did were for towing my 40' Toy hauler @ 18K empty and around 22K loaded. The mods yeilded me maybe .5-1 MPG gain, but significantly more pulling power (torque) which is what I need.
Get a respectable tuner and keep it within safe limits and you'll have a blast.
Empty your still over towing capacity.
Diablo's are really nice programers but something like a smarty are nice to have so you can adjust your tune on the fly plus it'll save you from buying boost/pyro/etc gauges