The 15.35 Inch Cummins ISC Diesel Oxidation Catalysts with a 12.05 Inch Diameter are designed to provide high durability and effectiveness in reducing exhaust emissions. Manufactured according to OE technology, these catalysts are made to match OE performance and are a direct replacement for most Cummins ISC makes and models. With features like reduced backpressure and fuel consumption, stainless steel construction, and included clamps and gaskets, these catalysts offer practicality and convenience. They meet the EPA07 exhaust emission norm and come with direct OE replacement numbers for easy identification.