VW Amarok (2013+) 2L Twin Turbo TDI400 TDI420 3' Stainless DPF Delete ExhaustSKU: M3 158 M3 166 Problems with the Amarok Diesel Particulate Filter are well documented. The Amarok runs an active DPF system that traps harmful diesel particulates in a honey comb structure, and then burns them off as the DPF flow is reduced. In the Amarok, often the soot left behind after the burn cycle can build up and cause a permanent blockage and expensive failure Signs your DPF is failing include reduced engine performance, higher fuel