Sports air filter from K&N company, short 4 inch, air inlet 4 inch, K&N original filter, 4 inch small from K&N Filter company. Description: Sports air filter from K&N Filter company, 4 inch air inlet. Features of K&N filter: Increases airflow to the car engine Improves engine performance and torque Provides fuel consumption savings Easy to install and clean Reusable Choosing the right filter: Make sure to measure your car's air inlet before purchasing the filter Choose the filter that fits your car's air inlet length Ensure the filter is compatible with your car type Tips: Clean the K&N filter regularly to ensure the best performance Replace the K&N filter every 50,000 km Additional information: Types of K&N filters: URL types of K&N filters How to install a K&N filter: URL how to install a K&N filter How to clean a K&N filter: URL how to clean a K&N filter #K&N filter cleaner oil