these performance modules are just a resistor. you can buy one at radioshack for 3 bucks. it changes the voltage in a sensor. the most popoular place to use this mod is in the AIT. it may give you 2-3 hp maybe. not worth spending more than 3 bucks for it though.
a performance ecu is the way to go or a microtuner. i dont know if anyone is making it for the honda.
hondarocket