Using your K&N replacement air filter is easy. First, open your vehicle's factory air box. Then, take out the old air filter and replace it with the K&N filter. Make sure it fits snugly in place. As for maintenance, you don't need to replace it often like a regular filter. Instead, when it gets dirty, you can wash it. Just follow the cleaning instructions on the K&N website or the included manual. Use the K&N cleaning kit for best results. After washing, let it dry completely before reinstalling. Also, keep in mind that while the filter is designed to last a long time, it's a good idea to check it periodically for any signs of damage. If you notice any tears or excessive wear, it might be time to get a new one.