Dinex aftermarket DOC for Cummins engines meet or exceed OEM specifications and is a direct replacement for OEM part numbers 2606971, 2606971C9, and 2607044C91. Dinex Emissions specializes in the design, development, and manufacture of a complete line of Cummins aftermarket diesel oxidation catalyst (DOC) and related emissions critical components. Dinex DPF and DOC Coatings are based on a high thermal stability was coat formulation with excellent NO2 recycling characteristics.