2017, 2018 & 2019 Chevy / GMC Duramax Diesel 6.6L L5P. DPF delete parts to completely eliminate all emissions related components. Exhaust systems that delete your Diesel Particulate Filter (DPF), Catalytic Converter (CAT), Diesel Oxidation Catalyst (DOC) and/or Selective Catalytic Reduction (SCR). Remove your Exhaust Gas Recirculation (EGR) valve and cooler. Eliminate the need forDiesel Exhaust Fluid (DEF). With a DPF Delete capable tuner this can all be done without any diagnostic trouble codes or check engine light.