Using these APR brake ducts is easy. First, find a suitable spot in the front of your 2011 - 2014 Subaru WRX/STI to install them. Make sure they are firmly attached. You can choose to direct the air to the brakes, oil cooler, or intake according to your needs. When using them on the track or during aggressive driving, keep an eye on the temperature of your brakes and oil. If the brakes or oil get too hot, adjust the air - flow direction. For maintenance, regularly check the ducts for any signs of damage, like cracks or loose parts. Clean them with a soft cloth and mild cleaner to keep them looking good and functioning properly.