Hard to tell from the PDF if that's Tier IV or traditional Diesel exhaust. I can tell you inhaling anything from our pre-DPF '81 tractor isn't something you wa

Hard to tell from the PDF if that's Tier IV or traditional Diesel exhaust. I can tell you inhaling anything from our pre-DPF '81 tractor isn't something you want to do but I'd be curious to know how much modern DPF(Diesel particulate filters) make a difference.