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Spec for Success – X15 Family Changes for EPA 2021

The EPA ‘21 X15 product features 3 unique families: the Efficiency Series, Performance Series and X600 Series. Customers are used to there being a hardware difference between the Efficiency Series and the other offerings. However, there’s now a hardware difference between the X600 Series and Performance Series.

The below hardware changes were made to ensure that the reliability and performance needs of the X600 product are met. Any retroactive rating changes (uprating/derating) require documented OEM approval to meet GHG Phase 2 compliance.

As you know, Cummins is committed to offering three distinct families of the X15 to accommodate the diverse needs your customers. Ensuring that customers spec the appropriate family and rating for their operation sets both them and you up for success. Visit for assistance with spec’ing decisions. 

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