Swapping to a higher flow-rate fuel injector and a "big bore" fuel rail in and of itself does not make you more power. It increases the capacity of your fuel system to deliver fuel to the motor. In their stock configuration, most Honda motors tend to run rich so you're not going to make more power by just adding more fuel.

Answers to your mini-me swap questions that depends on what year your car is, and since it doesn't say it in your profile I can't give you an answer yet.