The Beru Ignition Coil Kit - 135143 is a comprehensive kit designed to improve the ignition system of a car. It includes a set of ignition coils, spark plugs, and spark plug wires, all of which are essential components for the proper functioning of a car's engine. The ignition coils are responsible for converting the low voltage from the battery into high voltage needed to create a spark in the spark plugs. The spark plugs then ignite the air and fuel mixture in the engine, allowing the car to start and run smoothly. The spark plug wires are responsible for delivering the electricity from the ignition coils to the spark plugs. This kit is essential for maintaining the performance and efficiency of a car's engine, and is suitable for most makes and models of cars.