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Well you could always remove the complete interior, sans the drivers seat..oh, lose the bed too, its just weighing the truck down. Seriously, these trucks arent like trucks of yesteryear. You just cant pull a smog pump, and cat, and go on your way. The only way you are going to get power is to bolt on, or to tune.
Oh definitely remove the front 4 x4 components while your at it. That would definitely lighten your load... How much do you weigh? If your a lard ***, you could go on a diet and that should help too.
Take a look at other threads posted here about power & tuners. Read for an hour or so and you will find most people are having the best luck of unleashing power by using a tuner. Edge, Preditor & Superchips are the most talked about. Seems like Edge is favored by most.