Easy upgrade to my 2006 F350. I have a noticeable difference in performance. Before the blue spring set, I got about 12-13 mpg. After that it hangs at the level of 14-15. Assuming the fuel is around 2.30 a gallon, that little bit won't pay for itself for long. I am by no means a mechanic. But a quick YouTube search gave me all the instructions I needed on how to replace.
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