Using this Injen cold air intake is simple. Just follow the included installation guide to fit it into your 1999 - 2000 Honda Civic Si. Make sure all connections are secure to ensure proper airflow. When it comes to maintenance, check the SuperNano - Web dry air filter regularly. You can clean it as needed to keep the airflow at its best. Also, inspect the intake tube for any signs of damage or debris. If you notice anything wrong, replace or clean the parts right away. And remember, this intake comes with a limited lifetime warranty, so take good care of it to enjoy its benefits for a long time.