Gazlo04

Does anyone know which actuator i can order for my A3 from the likes of ebay? Been told from the garage this is what is required but that it will be cheaper for me to order the part from ebay as if they go through a dealer then they will have to get the turbo as well. To order one i need the part number which Audi cant give me for liability reasons. Does anyone know which actuator i can order? 2011 A3 tdi, Engine is CFG