superchips flashpaq which i hear will add aproximately 70/70 hp/tq
For your year it's more like 20hp 20lbft max gain on 91 octane.
Do you have a crossover(x or h pipe) in your dual exhaust? If you don't that'd be an easy/cheap way to add back some power.
To the OP, intake, tune, exhaust is the big basic 3.