The Genuine VW / Audi Ignition Coil Kit - 178374 is a comprehensive kit of products designed specifically for cars made by Volkswagen and Audi. It includes a set of ignition coils, which are essential components in the ignition system of a car. These coils are responsible for converting the low voltage from the battery into the high voltage needed to ignite the fuel in the engine. The kit also includes other necessary components such as spark plugs, wires, and connectors. These products work together to ensure a smooth and efficient ignition process, leading to optimal engine performance. The kit is designed to fit a range of models from both Volkswagen and Audi, providing a convenient and reliable solution for car owners.