Using this Injen air intake is simple. First, make sure your engine is cool before installation. Follow the included instructions carefully to install it properly on your 1999 - 2003 Volkswagen Jetta or Golf with ALH TDI. Once installed, you'll notice the power boost right away. When it comes to maintenance, check the Injen SuperNano - Web dry air filter regularly. It's fully serviceable, so you can clean it when it gets dirty. To clean, gently remove the filter and use a recommended air filter cleaner. Make sure it's completely dry before putting it back in. As for driving, the intake is designed to work well under normal conditions, but avoid driving through deep water as it can damage the filter. Also, keep an eye on your engine performance and if you notice any issues, consult a professional mechanic. With proper use and maintenance, this intake will serve you well for a long time thanks to the limited Lifetime Warranty.