a header won't give u any noticable gains since honda already made a good one. If u want a sportier car than get an exhaust sytem that will be louder and u will feel like u are going faster. Neither header nor exhaust will give u a gain that will blow u away. I would reccomend getting an intake (short or cold air) and then working on suspension and wheels. If u still want more looks and deeper sound get an exhaust. I am most satisfied with my suspension setup. It makes the car 100X faster around corners where it really matters.