Using your Injen intake is straightforward. First, make sure your vehicle is turned off and cool. Locate the old intake system and carefully remove it according to your vehicle's manual. Then, install the Injen intake in its place, following the included instructions. When driving, you'll notice improved performance and a great sound. As for maintenance, check the air filter regularly. If it looks dirty, clean it using a mild cleaner and let it dry completely before reinstalling. Avoid using harsh chemicals as they may damage the filter. Also, make sure all connections are tight to prevent air leaks. And don't worry about long - term reliability because of the lifetime warranty, but always keep an eye on the intake's performance and appearance during regular vehicle checks.