This NTO (new take off part) is a brand new genuine Cummins Turbo, the superseded part number from your local Cummins dealer is: 5603711, the associated original stamped Cummins part number is: 5581368. The turbo comes as a full assembly with the Holset actuator and speed sensor, Cummins part number: 6374774, pre-calibrated from Cummins. There is no core charge, no hassle, this is a brand new direct replacement that was removed from a brand new engine. In the case that the actuator needs recalibrated or must be removed from the turbo for your application, it must be done by a professional that has documentation of completion of reputable training and follow the direct procedure stated by Cummins and Holset. In the event any of this, in addition to our original warranty terms and conditions, are not fulfilled accordingly, the warranty on this turbo will be void. Please refer to the part numbers provided here in the description to discern fitment and compatibility, and review all photos provided before placing an order and making your purchase. Thank you for choosing EKG Diesel Ltd.