How can i make my 1996 Honda prelude faster?

I have a 96 prelude. I recently got new headers and a cold air intake. Its a 5 speed. Its a pretty fast car considering that i left an 06 mustang on interstate. But, i want it to be faster. Is there anything i can do? Some guys from school were telling me to put a new 4 cylinder engine in it. But i kinda like the one i got. So what can i do to make it faster? It's not a v-tech. i have considered getting a turbo and putting in it, but i dont know any good kinds.