2008-2010 6.4 

The 6.4L Power Stroke was introduced for the 2008 model year. Strict emissions regulations and the overall questionable reliability of the 6.0L were primary factors that presented a need for a new, clean slate engine design. Quieter and cleaner than its predecessors, the 6.4L Power Stroke was the first engine introduced to the market that utilized twin turbochargers from the factory