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Underdrive Crank Pulley, Cold Air Kit, Cat-Back exhaust, an SCT Xcal3 (or LiveWire,etc...if you prefer) with a custom tune.
Also, consider changing all you fluids to synthetics (front and rear diffs, trans, transfer case, and motor oil)
Also, remove the stock mechanical fan, and swap it for an electric. Along w/ better mpg, that alone should be good for about 10hp. It take allot to move those fan blades through the air, especially at higher rpms.