This product is a genuine alternator manufactured by Volkswagen (VW) and Audi. The part number is 06B903018SX. It is designed to be a replacement for the original alternator in a VW or Audi vehicle. This alternator is specifically designed and tested to meet the quality and performance standards set by VW and Audi. It is compatible with various models and years of VW and Audi vehicles. This alternator is an essential component of the vehicle's electrical system, responsible for converting mechanical energy into electrical energy to power the vehicle's electrical components and recharge the battery. It is a reliable and durable product that is backed by the manufacturer's warranty.