It all starts with The World’s Best Air Filter. Even a K&N replacement air filter is limited by the size of the original air box but once we remove the air box we’ve got plenty of room to work with. Now we can apply our High-Flow Technology to a large conical open element air filter, providing more surface area for huge increases in airflow that turn into horsepower you can feel. The oversize air filter also captures and holds more dirt. This increases the service life before a cleaning is required (up to 100,000 miles for air intakes depending on driving conditions).