The 75-5104 intake kit has (2) airflow configurations. S&B includes a silicone box plug that can be installed or removed depending on personal preference and airflow requirements.
Silicone Box Plug removed: This configuration will provide an extra air inlet that will be pulled from the passenger side fender area.
Silicone Box Plug installed: This configuration will seal the secondary air inlet located on the side of the box facing the vehicle fender. The front-facing grill inlet and the front scoop will become the main source of airflow into the Intake Box.