Water/Methanol Injection Kits reduce the temperature of your intake charge. This cooling effect allows for more power to be had in your normally aspirated or forced induction application. Each kit includes fail-safes to protect your engine from damage. Most kits include a 1 gallon to 5 gallon reservoir tank. In most cases, a 50/50 water-methanol mixture is recommended for safety while having some benefits of the increased octane of methanol.