Eventuri Audi S4/S5 Carbon Fibre Intake System (B9)Eventuri Audi S4 S5 Carbon Fibre Intake System was developed by Eventuri to provide the most efficient and direct airflow path to the vehicle's turbocharger. The factory airbox is very restrictive and the cheap plastic material perishes over time. By replacing the OEM airbox with Eventuri's patent pending Venturi housing, airflow remains as laminar as possible. Furthermore, the addition of a true cold air feed by adding a scoop to the front grill