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Cummins Inc.’s 4-cylinder QSB3.3 and QSB4.5 engines offer a simplified Tier 4 installation across a broad 75- to 160-hp (56-119 kW) power range. With an air-intake-to-exhaust aftertreatment system specifically designed for highly flexible machine integration, the 3.3-liter and 4.5-liter QSB engines operate as integrated Tier 4 emissions systems with Cummins Compact Catalyst exhaust aftertreatment. Introduced for EPA Tier 4 Interim and EU Stage IIIB off-highway applications, the catalyst removes particulate matter (PM) by simple, flow through passive oxidation. With a smaller size than other types of aftertreatment, the Cummins Compact Catalyst can be installed in space-constrained equipment with the added flexibility of mounting separately from the exhaust muffler, or as part of a combined catalyst-and-muffler unit.