All parts supplied by AQG are tested in the presence of the customer prior to sale. Once the customer confirms satisfaction, the part is considered accepted, and the sale is final. In the event that an engine, gearbox, or differential is returned due to a verified fault, AQG reserves the right to charge a labor and handling fee. Any applicable refund will be processed only upon presentation of a valid invoice. Refunds will not be provided for change-of-mind purchases. All other parts are sold on a strict no-refund basis. No receipt, no refund—no exceptions.