actually yes, there is a pretty simple trick you can do.. you wire in a 12v to a 12v power on ignition (when ignition is on, power is on.) you run it to the back seat, you take off the fuel pump cover, hook up a ground , and run the wire into the tank, then make sure you do the same with the 12v wire, (if i were you the safest way is to run it through the grommet that the other wires are running through on the lid.) what this will do is send double the voltage to the fuel pump causing you to gain another 5-6 hp.
not really. but in all seriousness. there is no deletes that will make you gain hp. if i were you i would just swap out that motor. especially with 200,000 miles.