The Genuine VW / Audi Ignition Coil Kit - 178392 is a comprehensive set of products designed for use in a car's ignition system. This kit includes a variety of ignition coils, which are responsible for converting the vehicle's battery voltage into a higher voltage needed to create a spark in the spark plugs. The kit also includes other essential components such as spark plug wires, spark plugs, and other related hardware. These components work together to ensure the smooth and efficient operation of the vehicle's ignition system, helping to improve overall performance and fuel efficiency. This kit is specifically designed for use in VW and Audi vehicles, and it is a genuine product from the manufacturer.