The Genuine VW / Audi Drive Belt Kit - 178163 is a comprehensive kit of products designed to service the drive belt system of a car. It includes various components that are essential for maintaining the proper functioning of the drive belt system. The kit contains a drive belt, a tensioner, and an idler pulley. These components work together to transfer power from the engine to other critical systems in the car, such as the alternator, air conditioning, and power steering. The drive belt is responsible for rotating the pulleys, while the tensioner and idler pulley help to keep the belt in place and maintain proper tension. This kit is specifically designed for use in Volkswagen and Audi vehicles, ensuring compatibility and optimal performance. Regular maintenance of the drive belt system is essential for the overall health and longevity of a car, making this kit a valuable investment for any VW or Audi owner.