A relay is a crucial element in car tuning as it acts as an electrical switch that controls power to various car components. When it comes to tuning, it is important to have reliable and efficient relays to ensure optimal power management. These parts are responsible for controlling important functions, such as ignition, fuel pumps, cooling fans and more. By using high quality relays you can improve your car's performance, efficiency and safety. Relays with a built-in fuse are easy to install as you do not have to have a fuse holder next to the relay.