Water/Meth injection is used to suppress detonation and to safely allow much greater amounts of boost and or compression. When used the right way, it has benefits similar to running race fuel all the time.
When a nozzle is placed after the throttle body the droplets reach the combustion chamber and smooth the entire process. It melts away any carbon deposits and eliminates the glowing hotspots. Basically, it allows you to have a more smoother combustion instead of a violent bang bang, which leads to broken internals and pistons. I highly recommend our throttle body flange upgrade because it places the nozzle after the throttle body, and you don't have to tap into your manifold or any other position, and most importantly throttle bodies are expensive. I am sure you are aware of what would happen if you sprayed liquid into an electrical component
You can also run a dual nozzle kit and put another nozzle post intercooler if you have a turbocharged vehicle. The droplets absorb the heat from the intake air. The droplets start to evaporate causing the intake charge to be cooled even further. (almost like running your in 100degree temps, but your engine thinks it 40degrees) significantly provides better cooling, and you can never have to much cooling.
Allows for maximum power output while substantially increasing overall engine reliability.
Depending on what setup your vehicle is (stock turbo or bigger) I would recommend the Snow Performance Boost Cooler Stage 2 Kit
There are two methods of controlling your spray. Either MAF or MAP based. If you are on a stock turbo or similar you would get best results using MAF controlled. On a turbo bigger, the MAP sensor would be usable as it would give you more accurate readings.
You need to make sure your nozzle sizes are correct. Too much spray will put the fire out, and too little spray is just under powering your vehicle, then whats the point right? We can help you pick out the precise nozzle sizes that you would need.