Civic Modification Help?

Well one, i would skip the projector headlights. The reason is they can produce twice the amount of heat as your regular factory head lights, causing your headlight emblies to melt and possible fire. OK now, intakes and headers, The first thing you need to know is, if you want a good intake or header your going to have to be willing to pay for it, because anything good is not cheap. So i would suggest going some tuner sites and look for Dino sheets and claims from other civic owners. Intakes usually install really easy with moderate hand tools, but headers can be very time consuming and they don't always fit right, and if you have salt and rust where you live it may take you the better part of a day, but if you are wondering what kind of numbers to be expecting with a new intake and header, i would say around 15 to 20 horse power, and a few miles drop in your mileage.