The Genuine VW / Audi Ignition Tune-Up Kit - 178435 is a comprehensive kit designed to improve the performance and efficiency of a car's ignition system. It includes a variety of high-quality products that are specifically selected to fit VW and Audi vehicles. The kit contains a spark plug set, ignition coil, ignition wire set, and distributor cap and rotor. These products work together to ensure that the engine starts smoothly and runs at its best. The spark plug set provides the necessary spark for the fuel to ignite, while the ignition coil amplifies the voltage to create a stronger spark. The ignition wire set carries the electrical current from the ignition coil to the spark plugs, and the distributor cap and rotor distribute the spark to each cylinder in the correct firing order. This kit is essential for maintaining the proper functioning of the ignition system and ensuring optimal engine performance.