Using this K&N air filter is easy. First, locate the air filter housing on your Harley Davidson Sportster 883 or 1200 with the Screamin' Eagle Upgrade. Open the housing carefully and remove the old air filter. Place the new K&N air filter in its place, making sure it fits snugly. Close the housing. As for maintenance, it's recommended to check the filter every few months. If it looks dirty, you can clean it with a K&N filter cleaning kit. Avoid using harsh chemicals as they can damage the filter. Also, when installing or removing the filter, handle it gently to prevent any tears or damage.