Through my experience with various Honda engines-- intake, header and exhaust do not give noticable power gains without TUNING! Even with tuning the gains are marginal. If you want power, boost it up or better yet learn to drive better.

Said it a thousand times but i'll say it again, driver skill greater than almost any possible mod. A lot of old foggies with stock cars destroy the young dudes with hopped up jdm rides at the track.