Replacing the engine's air filter is a great way to boost horsepower and, in some cases, even improve fuel efficiency. It is recommended to change the engine filter at least once a year or as per the vehicle's owner's manual. High-flow air filters are a great option as they don't need to be changed as often, only needing to be cleaned approximately every two years. This is because they offer better airflow and filtration of the air entering the engine, which can result in an increase of 3 to 5 HP and torque.
Additionally, some of the more expensive units come with a cold air intake unit that extracts air from outside the car instead of the hot air used inside the engine compartment. Cold air is denser and therefore burns better, which improves engine performance. Disposable paper filters can restrict airflow due to their small openings that are necessary for effective filtration. This can cause a decrease in power as air is expelled at the cost of the vehicle's energy. K&N filters can retain significantly more dirt and particles per square inch of material than a regular paper filter, making them a great option for those looking to increase power, fuel efficiency, or reduce the hassle of changing their air filter regularly.
However, they can expose the engine to more debris and contaminants due to increased air intake. K&N intakes protect the engine by using a specially designed, high-quality, high-flow air filter that increases airflow by up to 50% compared to a traditional disposable paper air filter. The intake tube is designed to flow a large volume of oxygen-rich air without excessive baffles or components that slow down air flow.
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