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Inside the Cummins X15 EPA21 HE400 Turbocharger: What Changed and Why It Matters While we at Momentum Worx still think of the Cummins X15 engine series as something "new"; this motor has long been a powerhouse in the heavy-duty trucking world at this point.  Each new emissions iteration brings not just regulatory compliance, but sometimes subtle—but significant—engineering changes. The EPA21 version of the X15 is no different, particularly when it comes to its turbocharger: the …