So was removing my DPF and had everything ready to come out. The 3 sensors unscrewed easily after spraying them twice with WD-40. I went to slide the little rubber boot off of the factory DPF and it tore in half. This is the rubber hose that is approximately an inch long and slides over the nipple on the DPF pipe and has a amall black box hooked to it. Does anyone know the purpose of this part? I am going to order a new one from Ford. I was just wondering if anyone else had this problem. Thanks!