Mishimoto 11+ Ford 6.7L Powerstroke Secondary Expansion Tank - Micro-Wrinkle BlackThe 2011+ Ford 6. 7L Super Duty is a workhorse of a truck and the go to pickup for many of the hardest working people on Earth. The 6. 7L Powerstroke that propels the 2011+ F 250 and F 350 is robust and reliable, but it's not without its weaknesses. Like any large displacement turbodiesel, the 6. 7L generates an immense amount of heat and strain on the charge air cooling system. Luckily, the engineers at Ford fitted the Super Duty with a robust