The 13.31 Inch Cummins ISX Diesel Oxidation Catalysts with a 13.27 Inch Diameter are designed for high durability and effectiveness, reducing backpressure and fuel consumption. Manufactured according to OE technology, these catalysts are made to match OE performance and fit most Cummins ISX models. With a stainless steel construction and exhaust emission norm of EPA07, these catalysts have a reduced environmental impact. Each unit comes with clamps and gaskets included, making it a practical and direct OE replacement for numbers 2880507 and OTR58205.