Using this Injen cold air intake is simple. Just follow the installation instructions provided in the kit. It's designed to fit your 1999 - 2000 Honda Civic Si. When installing, make sure all connections are secure. As for maintenance, check the Injen SuperNano - Web dry air filter regularly. If it gets dirty, clean it according to the cleaning instructions. This will keep the airflow efficient and the engine running well. Also, keep an eye on the air - fuel ratios during use. If you notice any unusual performance changes, it might be a good idea to have your vehicle checked. With proper use and maintenance, this intake will serve you for a long time, thanks to the limited lifetime warranty.