Complex sentence: The most common use of water injection today is vehicles with aftermarket forced induction systems such as turbochargers or superchargers which are commonly tuned with a narrower margin of safety from detonation and benefit greatly from the cooling effects of vaporized water.
Split into simpler sentences: The most common use of water injection today is in vehicles with aftermarket forced induction systems, such as turbochargers or superchargers. Such engines are commonly tuned with a narrower margin of safety from detonation and hence benefit greatly from the cooling effects of vaporized water.