NOS Max Street Octane Booster is a fuel treatment. NOS maximum performance for the street was developed to increase octane effect up to 30 points or 3 octane numbers. It is blended with the strongest MMT concentration allowed by law for street use. Also contains unique performance enhancing Powertane. Max Street Octane Booster improves gas mileage, eliminates knocks, pings, and hesitation as well as protects against carbon deposits in the fuel injectors and combustion chamber. It restores and improves horsepower.