As you learn about vehicular modifications, you may eventually hear about water/methanol injection systems. These systems introduce a mixture of water and methanol fuel into your car to reduce inlet temperatures and exhaust gas temperatures, which can stifle detonation in the engine. For forced induction engines using a turbocharger or supercharger, they can provide some key benefits. There are several pros and a few cons of using a water/methanol injection system; here are a few of the key ones to keep in mind.