NOS oh yes babe!!!
Nitrous oxide is adrenalin in the gas tank pure and simple. its combustion ignites crazyness in the cylinder heads. Nos can be dangerous in terms of your engine can blow if too much is injected into the cylinder heads due to the intense pressure and strain on the pistons. I recommend the new ZEX systems. they are controlled by a CPU unit and control themsleves. installation is a cinch. Once the switch is flipped and activated it inserts Nos when your car reaches max throttle so it conserves nos until u really need it. The system is great, very easy to use and very reliable. retail about 500 to 600 for vehicle specific apps. a 50 to 75 shot of Nos is fine for a car well maintained and tuned up a little. anything over a 100 shot is for the big boys whose cars wont leave the bodyframe at the starting line. Nos can give u an instant 50 Hp increase in most simple apps. great for the everyday street dragger.
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Turbos vs. Superchargers: simplified explanation
Turbos take exhaust gas from the headers and spool it up cool it via an intercooler and shoot it back into the cylinder head. here u are gaining power because the exhuast fumes are used up again and make way for more air. the t3/t4 turbos are the ones on the market to look for. these can be tuned up to 20psi for engines that can take it. the Psi rating refers to how much pounds of air per square inch is shot back into the cylinders. about 10 to 12 PSi is perfect. Turbos have one major problem, they are freaking expensive. Greddy makes one of the best T3 kits for civics, integras, and eclipses. the kits comes with all u need including wastegates and intercoolers, and even boost gauges to make your interior look STRAIGHT! Turbos can easily add about 75 to 100 hp to any application.
Superchargers are another forced induction system but they need to be attached to your engine via a belt so they help turn the pulleys. They also use exhaust pressure as the turbo does. Jackson racing makes one of the best for a fee of 2500 or so, and if u have a civic SI, vortech has a new technology supercharger for SERious gains these also are about 100+ hp boost.
Downfall of the turbo is that when u first start the car there isnt much exhaust to be spooled up so the turbo goes through what is called turbo lag, which can also occur after hard driving and flooring it because the turbo can't spool up and spit out exhaust that fast and efficiently meaning they are basically useless for a while, until they get some exhaust.
Superchargers on the other hand are always charged up because the engine is using the attached belt to turn the component.
It's your choice, i personally like the turbos. In any case you are going to have to start putting that high octane gas in at all times but its worth it. Who doesn't want a little flame coming out the muffler!!