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The 6.4L uses a K16 high-pressure fuel pump that can flow as much as 20 percent more fuel than the 6.7L’s Bosch CP4.2. While certainly an advantage, the 6.7L catches up by featuring as much as 30,000 psi of injection pressure. The Bosch CP4.2 fuel pump is more easily accessible, while the K16 lies deep within the engine. Though they hail from the same lineage, the 6.4L Powerstroke could not be more different than the 6.7L model. Make sure you have all the supplies you'll need