Your search for the best and most reliable aftermarket diesel particulate filter (DPF) available today has officially ended with the BIG Machine Parts line of diesel particulate filters. Crafted of "rock-solid" 409 Stainless Steel and manufactured exclusively in North America, BIG Machine Parts is the name to trust with your truck. Why buy re-manufactured when you can save on a NEW, coreless DPF from BigMachineParts.com? Field and laboratory tested to exceed OEM standards, all BIG Machine Parts DPF come with a 1-Year, Unlimited Mileage Warranty. .