Using your Injen cold air intake is easy. First, make sure your engine is cool before installation. Follow the included instructions to fit the intake properly to your 2007 - 2012 Nissan Sentra. Once installed, start your engine and enjoy the improved performance and great sound. When it comes to maintenance, check the Injen SuperNano - Web dry air filter regularly. You can clean it when it gets dirty. Just follow the cleaning instructions provided. Also, keep an eye on the intake tube for any signs of damage. If you notice any issues, contact Injen support. And remember, always use the intake in accordance with local laws and regulations.