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Five G-Drive QSX15 generator engine models provide EPA Tier 4 Interim certification up to 627 hp/60 Hz and EU Stage IIIA certification up to 619 hp/50 Hz.
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.