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The Cummins QSX engine not only meets Tier 3 and Stage IIIA emissions standards, it is the base platform to reach Tier 4 requirements as well. It uses in-cylinder technology, a simple and cost-effective solution that maintains the proven performance, dependability and durability of the QSX while operating cleanly and efficiently. The QSX combines an advanced dual overhead cam design with proven heavy-duty components for dependability without compromise, every hour of every workday. Its unique dual overhead cam design allows the engineers at Cummins to optimize combustion efficiency, add to that our wastegated turbo with excellent response and powerful torque rise, and you have an engine capable of delivering optimum performance at every rpm. Available in a range of ratings from 375-630 hp (280-470 kW), the QSX offers an impressive range of standard features. And options like REPTO (Rear Engine Power Take-Off) add functionality.