Using the Hella horn kit is a breeze. First, make sure your vehicle is turned off. Then, use the included mounting bracket and hardware to securely attach the horns to your car. Connect the wiring harness following the simple plug - and - play design. Once everything is connected, turn on your vehicle and test the horns. Note that this kit doesn't fit the WRX GT model, so double - check your vehicle type before installation. For maintenance, keep the horns clean from dirt and debris. You can use a soft cloth to gently wipe them. Regularly check the wiring connections to ensure they are secure. Also, make sure the horns are not blocked by any objects, as this can affect their sound performance.