Blah... this has been covered 1789735234523458045 times, but things such as your water pump, thermostat, headgasket, etc. - the things that keep the engine running in good condition should be replaced (if not functioning correctly OR if its been a while). A full compression test is also recommended. If your leaking oil (like plenty of civic owners), its also recommended that you get that fixed too since oil pressure is a neccessary part of boosting.