This 35.5 inch stainless steel non-air assisted one box without DPF is a practical and reliable solution for Freightliner, Western Star, and Detroit Diesel vehicles. With a durable stainless steel construction and a patent pending design, this product is manufactured according to OE technology and performance validated by an independent test institute. It fits most makes and models and comes with clamps and gaskets included. With direct OE replacement numbers, this one box offers a seamless and efficient exhaust emission norm, making it a beneficial choice for your vehicle.