The Genuine VW / Audi Ignition Coil Kit - 178391 is a comprehensive set of products designed specifically for cars from the Volkswagen and Audi brands. This kit includes three essential components for the ignition system, which are crucial for starting and running the vehicle. The first component is the ignition coil, which is responsible for converting the battery's low voltage into the high voltage needed to create a spark in the spark plugs. The second component is the spark plug, which is responsible for igniting the air and fuel mixture in the engine's cylinders. The third component is the ignition control module, which regulates the timing and strength of the spark. This kit is designed to ensure that all these components work together seamlessly to provide reliable and efficient ignition performance for your vehicle. It is a genuine product from the manufacturer, making it a high-quality and reliable choice for maintaining your car's ignition system.