Using your K&N Universal Air Filter is easy. First, find the right spot for it based on your equipment's air intake. Make sure the filter is properly aligned and then use the rubber flanges to attach it securely. If the size is a bit off, you can stretch the flanges up to 1/16 of an inch (1.5mm) to get a good fit. When it comes to maintenance, since these filters are washable and reusable, clean them regularly. You can use a mild cleaning solution and rinse thoroughly. Let it dry completely before reinstalling. Also, keep an eye on the rubber flanges for any signs of wear or damage. If you notice any issues, it might be time to replace the filter.