Octane Boost. provides the performance and protection you need to keep your collector car, muscle car or other high performance vehicles running like new. Octane Boost products contain 5 unique ingredients that in addition to boosting octane, also clean and lubricate both the Complete Fuel System and the Complete Combustion System, which helps improve horsepower, acceleration, and increase your vehicle's gas mileage. Reduces Knocks, Pings and hesitation and is safe for Catalytic Converters and Oxygen Sensors. Both products are safe to use in every tankful, for optimal performance, or whenever performance feels sluggish.