Unlike the 10th Gen Civic 1.5T chassis, the 11th Gen / 5th Gen Integra features a rather large and efficient air duct through the front bumper/grill from the factory. We elected to retain the factory air guides, and utilize them in our HVI design. Our engineers decided to take this one step further, though. In an effort to promote maximum airflow volume, our HVI comes standard with it's own injection molded High Volume Inlet Duct that attaches to the air box with OE-style clips and seals against the factory rubber seal/guide on the hood. We have also integrated a provision at the bottom of our air box for enthusiasts looking to turn this intake into a true cold air intake by installing our High Volume "Plus" Cold Air Intake Duct! NO ECU CALIBRATION REQUIRED