Using these APR Carbon Fiber Brake Ducts is easy. First, locate the front area of your 2011 - 2014 Subaru WRX/STI where the ducts need to be installed. Make sure the area is clean before installation. Once installed, you can choose to direct the air flow. If you're going on a track day or driving aggressively, direct the air to the brakes to keep them cool. For longer drives where oil temperature might rise, direct the air to the oil cooler. When directing air to the intake system, just let it do its job to improve engine performance. As for maintenance, regularly check the ducts for any signs of damage, like cracks or loose parts. Clean them gently with a soft cloth to keep them in good condition. If you notice any issues, it's best to get them checked or replaced as soon as possible.