Using your Hella horn kit is a breeze. First, check if your vehicle is a 2022 - 2025 Subaru WRX (it won't work on the WRX GT). Install the kit by using the provided wiring harness and mounting bracket for a quick plug - and - play setup. When choosing between the Super Tone and Sharp Tone kits, pick the one that suits your sound preference. As for maintenance, keep the horns clean and dry. Check the wiring regularly for any signs of wear or damage. If you notice a change in the sound quality or if the horns stop working, it might be time to have them checked. Also, make sure to follow all local laws regarding horn usage to avoid any legal issues.