B3.9, B4.5, and B5.9 Industria [...] Cummins® Service Engine Model Product Identification Section E - Engine and System Identification Page E-11 Technology Name Suffix Exhaust Gas Recirculation Not used None Pneumatic P Electric E Diesel Particulate Filter (DPF) Not used None Full Flow DPF F Partial Flow DPF F2 Diesel Oxidation Catalyst Not used None DOC C 3-Way Oxidation Catalytic Converter Not used None 3-Way Catalyst J Selective Catalytic Reduction System Not used None Air Driven S Airless A Nox Sensor Not used None Nox Sensor N Modular Common Rail System Used only on QSK19, 38, 50 , 60 HHP Engines MCRS Integrated Dosing Control Unit Not Used None Integrated I