Using the horn kit is straightforward. First, gather all the included parts: the horn kit (either Super Tone or Sharp Tone), the mounting bracket with hardware, and the wiring harness. Make sure your car is turned off before you start the installation. Find a suitable place in your vehicle to mount the bracket according to your car's layout. Attach the horn to the bracket using the provided hardware. Then, connect the wiring harness to the horn and make sure all connections are secure. Once installed, turn on your car and test the horn to ensure it works properly. As for maintenance, regularly check the connections of the wiring harness to make sure they are not loose. Clean the horn with a soft cloth to keep it in good condition. Also, note that this kit does not fit the WRX GT model, so double - check your car model before installation.