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The Cummins QSC engine meets Tier 3/Stage IIIA emissions standards, by using in-cylinder technology, a simple and cost-effective solution that maintains the proven performance, dependability and durability of the QSC while operating cleanly and efficiently. Cummins QSC engines are built on durable engine block designs. The QSC advanced electronics provide enhanced engine performance with higher torque and better throttle response at every rpm. Electronic engine control provides additional advantages that include increased fuel economy, precision diagnostics and engine protection. The QSC also offers enhanced maintenance intervals, improved cold starting plus up to 50 percent quieter operation for improved operator comfort.