there is a sticky full of performance tips? Like most engines, performance will come in the form of ways to get more air through the engine....better flowing heads/TB manifold and headers/betterflowing exhaust THEN get it tuned or add a tuner. Those are the the easiest ways I can think of without going to a bigger displacement engine.
super coild are going to give you the same performance boost as extra expensive plugs and wire on a stock engine.....(pretty much all in your head) although better wires help in other ways like better shielding. btw cheap autolite 3923 plugs add 5 dynoproven hp over stock champions.