The 11.83 Inch Cummins ISC And ISL Diesel Oxidation Catalysts are designed with a 11.75 inch diameter, making them a perfect fit for most Cummins ISC and ISL models. Manufactured according to OE technology, these catalysts offer high durability and effectiveness in reducing exhaust emissions. With a stainless steel construction, they provide reduced backpressure and fuel consumption, resulting in improved performance. Each catalyst comes with clamps and gaskets included, ensuring easy installation. As a direct OE replacement, these catalysts are made to match OE performance and meet EPA07 exhaust emission norms.