Using your K&N Universal Air Filter is easy. First, find the air intake area of your vehicle or equipment. Remove the old air filter carefully. Then, take your new K&N filter and place it in the air intake, making sure the rubber flange fits snugly. If it's a bit tight, you can gently stretch the flange up to 1/16 of an inch (1.5mm) to get a proper fit. As for maintenance, it's recommended to clean the filter regularly. You can use a K&N filter cleaning kit. Simply follow the instructions on the kit to wash the filter. Let it dry completely before reinstalling it. When handling the filter, be gentle to avoid damaging the rubber flange. Also, make sure to check the compatibility list to ensure it's the right filter for your vehicle.