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Restore the peak engine performance of your ride with aFe Power’s Pro Guard HD Fuel Booster. It contains additives like Cetane Maximizer that helps enhance the running condition of the diesel engine. This fuel booster is alcohol free and has an anti-rust and corrosion compound and can prevent clogging on the fuel lines, tank and filters. aFe Power Pro Guard HD Fuel Booster also help improve the engine in extreme heat.