This product is a Walker brand Ultra EPA direct-fit catalytic converter with a 2.25" outlet for exhaust systems. It is designed for use on vehicles to reduce emissions and meet EPA standards. The manufacturer part number is 16187, and it is made in the USA. The interchange part numbers include 642992, 912269, 912277, 642991, 079-3133, 642979, and 079-3134. (C)