I had a 98 accord.... great car. Anyways, the best way to increase HP is to start swapping internal parts or go with a turbo. Cost being a factor, I'd go with all three (headers, exhaust and intake) it's not cheap, but the cheapest option. Stay away from knck offs.... they'll break and destroy something else on the car.... invest in good parts and be worry free. It will be a lot noisier but that's a part of "releasing the power" in the engine.... good luck and have fun.