Exhaust might wake it up a little. Borla is a great brand, and obviously TRD is too. that combined with a good air filter *might* get you 15 more HP, so not a lot, but a little and at least itll sound cool.
Also, a good rear locker is all you really need unless youre gonna get pretty hardcore.
Front lockers are priceless when needed, but how often will that be for you? I dont have a locker in the rear of my current rig yet, and still havent *REALLY* needed it yet. Hoping to do it this winter anyway just because its more fun drifting in the snow in 2wd, and of course when flexing enough to lose traction on the trails