The 15.65 Inch Cummins ISB Diesel Oxidation Catalysts with a 10.63 Inch Diameter are designed to provide high durability and effectiveness in reducing backpressure and fuel consumption. Made with stainless steel construction and manufactured according to OE technology, these catalysts are a direct OE replacement for most Cummins ISB makes and models. With a wide range of features including a reduced exhaust emission norm of EPA07, clamps and gaskets included, and compatibility with OE performance, these catalysts offer practicality and reliability. Direct OE replacement numbers include 4965338NX, 5287474NX, 4965338, 5287474, 4965338RX, 5287474RX, and OTR0152046.