Using this Injen cold air intake is straightforward. First, make sure your engine is cool before installation. Locate the old air intake system in your 2008 - 2014 Scion xD Base and carefully remove it. Then, install the new Injen intake following the included instructions. Make sure all connections are tight. When it comes to maintenance, check the Injen SuperNano - Web dry air filter regularly. If it looks dirty, you can service it according to the cleaning guidelines provided. It's important to keep an eye on the air - fuel ratio, but with Injen's design, it should stay safe. Also, be aware that this intake gives an aggressive tone, which is normal and part of its performance. Always follow the instructions in the kit for the best results and to keep your warranty valid.