Our Open PEX Intake System does away with the closed airbox design and uses a massive 7" washable and reusable cotton filter with a frontal inlet and 4" rear outlet. This was necessary to limit pressure drop across the factory system and maximize airflow, while allowing you to fully hear the engine breathe. The massive filter provides excellent filtration. By oversizing the filter, we're able to limit pressure drop without sacrificing filtration. This is made possible through the use of greatly increased filter surface area. The PEX material gives the intake an Oem feel and it allows us to make a complex and organic heat shield shape that keeps hot air pushed through the frontal radiator away from the intake tract. Lastly, PEX retains heat less than other materials such as metal, making it ideal for performance.