'04 Corolla S Performance?

What can I do to my '04 Corolla to get more horsepower out of it beyond a TRD supercharger, cold-air-intake, and ehaust?

Please someone tell me what's possible or available?

performance module, underdrive pulley kit is a good option but installation is probably tricky but good bang for the buck. i heard if you put a tornadofuelsaver with cold air intake that's about 20 hp