The Best Protection for the Engine UFI air filters guarantee the maximum filtering efficiency. They're integrated in the engine and help limit the noise it emits. These are just a couple of the benefits offered by our spare parts. The air filter is essential as it cleans the air that arrives in the combustion chamber, and UFI was the first manufacturer to introduce the panel air filter in the 1970s - a technological innovation that then spread across the entire market. Made of cellulose and combined with resins or with pre-filters in fabric-non- fabric, UFI's filtering materials prevent the alteration of the fuel flow in the carburettor and the subsequent loss of power, increase in consumption and emissions into the atmosphere.