Take your assembled Ram-Air housing and bolt it to the large main housing and slide it into place. There is an OEM bolt mounted to the firewall under the intake that you will need to line up the intake system with. It's easy to do and you cannot miss it. Just keep an eye out for it when installing your intake. The new larger housing has a specially designed inlet and low-restriction tubing to optimize airflow. The included filter also carries a lifetime warranty.