I have an 89 Honda Prelude S. I want to gain some more horsepower. What can i do, please help.?

here's the best advice i could give you, and you probably won't listen to me anyways but here it goes. Unless you REAlly like the 3 Gen preludes DO NOT, DO NOT, do anything to it. You have a prelude S, came with the Worst engine of its generation the B20A3 (carburetted, single cam, and 12 valve, 104 Hp, ). Ifs its a car you got for free i suggest you sell it or keep it on the side as a gas saver and get yourself an affordable car you want. Believe me you;ll end up spending more money than its worth, you wont be satisfied.. the 89 prelude is not a popular platform either, hard to find parts for, i suggest you find a 4 gen prelude with an H22a1 engine. in the mean time buy books that teach you how to gain more horsepower for your vehicle.