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Cummins Inc.’s QSX11.9 and QSX15 heavy-duty engine duo features the performance-enhancing technology of the Cummins Xtra-High Pressure Injection (XPI) fuel system and a variable geometry turbocharger. The 11.9-liter and 15-liter QSX are supplied as fully integrated air-intake-to-exhaust aftertreatment systems to meet 2011 EPA Tier 4 Interim and EU Stage IIIB regulations. The engines use a Cummins Particulate Filter to reduce Particulate Matter (PM) emissions by over 90 percent and incorporate a proven cooled Exhaust Gas Recirculation (EGR) system to reduce oxides of nitrogen (NOx) emissions by 45 percent.