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i have a 95 prelude wiht a 96 h22 engine, i want to put a turbo kit, but im figuring that u need more then that to make it work..i heard i have to change the fuel rail and pistons and other things, is that true??

 
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I don't know the specifics of that car, but in general...Internal components like pistons should not be a problem, unless you run very high boost pressure. Very high boost often requires a number of mechanical changes.A few important things happen when turbo charging an engine. One is intake air temperature is often higher after passing through the turbo. Two, vacuum pressure into the intake changes from vacuum to positive pressure under boost, and total air flow increases. Three, following the increased air flow the fuel must be able to keep up.Addressing the first two requires modifying the emission control computer or adding supplementary units to "fool" the computer. Adding an intercooler helps bring air temperature back down. Today's engines monitor air temperature, and a host of criteria, to produce the correct mixture.The computer and fuel system work together. As you open the throttle the computer is programmed to increase fuel by triggering injectors more often (over simplified). But the computer doesn't know anything about mixing fuel into the amount of air being forced in by the turbo, this is the fuel cutoff, no additional fuel is mixed to the air and you run extremely lean. The computer must be modified or supplemented to add more fuel. The factory injectors are designed for intended use only and likely will not be able to keep up with fuel demand. Even if the computer calls for more fuel to mix with the turbo air, the injectors cannot provide it. Fuel injectors will have to be upgraded, and in some cases so will the fuel pump.If your turbo "kit" includes electronics you may have all you need to deal with the emission controls. But you will still likely need to upgrade the fuel system.There are some other issues as well, like blow off or bypass valves.