for practically the same price as a Turbo kit you can swap in an H22a, makes 200 hp stock 40 more hp than your B16 si. Nitrous is bad on engines period, I wont suggest that to anyone. You can try bolt on's, but you wont feel that much of a difference. The best thing I would say for bolt on's are, Fuel pump, Injectors, intake, cat-back, high flow cat, fuel pressure regulator, MSD ignition/cap/rotor/wires, pulleys, and maybe some camgears. Other than those, I definitely say swap it. I had a 99 civic EX coupe that I started swapping in a H22a, but ran out of money, plus the car was damaged, so now I have a 91 civic with a JDM B16a. Im happy with it.