What’s my air filter got to do with it ?

An air filter primarily filters the air entering the engine from outside. This air needs to be rich in oxygen to help the combustion in the engine’s cylinders. The better purified the air is, the better the oxygen content. The better the oxygen content, the better is the combustion, leading to better power and mileage. A performance filter like K&N keeps out particulate matter and improves airflow considerably. This impacts the engine’s efficiency, creating more horsepower and torque.