The 8.66 Inch Volvo And Mack D13 / MP8 Diesel Oxidation Catalysts are designed with a 14.17 inch diameter, making them a practical and efficient solution for reducing exhaust emissions. Manufactured according to OE technology, these catalysts are made to match OE performance and provide a direct replacement for Volvo and Mack D13 / MP8 models. With a stainless steel construction and included clamps and gaskets, these catalysts offer durability and convenience. Meeting the EPA07 exhaust emission norm, they are a reliable choice for improving air quality. Compatible with OE replacement numbers 20864132, 21850647, 85000779, 85001354, and OTR0152043, these catalysts ensure a seamless fit.