The 11.9-liter QSX11.9 and 15-liter QSX15 Heavy-Duty engines are supplied as fully integrated air-intake-to-exhaust aftertreatment systems to meet 2011 EPA Tier IV Interim/EU Stage IIIB regulations.

• Incorporate the Xtra-High Pressure Injection (XPI) fuel system and a variable geometry turbocharger
• Cummins Particulate Filter reduces Particulate Matter (PM) emissions by over 90%
• Cooled Exhaust Gas Recirculation (EGR) system reduces NOx emissions by 45%
• Up to 5% improved fuel efficiency compared with Tier III, depending on duty cycle