Eventuri Audi B9 S4 / S5 Black Carbon Intake SystemPerformance Gain: 13 17hp, 15 20ft lb V Box Acceleration: 60 130mph Reduced By 0. 5 Seconds The Audi B9 S4 S5 Eventuri intake was developed to give less restrictive airflow to the turbo whilst maintaining low inlet temperatures. The S5 S4 engine bay becomes heat soaked very quickly so simply having an open cone system would result in better airflow but with higher inlet temperatures. We therefore completely re engineered the inlet track from the turbo