The 11.81 Inch Cummins Diesel Oxidation Catalysts with a 10.31 Inch Diameter are a high-quality product designed to reduce exhaust emissions and improve fuel efficiency. Made with stainless steel construction, these catalysts are durable and effective, providing a direct OE replacement for most Cummins makes and models. With a reduced backpressure and fuel consumption, these catalysts offer practical benefits for vehicle owners. Each catalyst comes with clamps and gaskets included, ensuring easy installation. Manufactured according to OE technology and designed to match OE performance, these catalysts are a reliable choice for improving your vehicle's environmental impact.