Quote:
Originally Posted by Run to Rund
Art, if you have a Cummins in your 550, call Mark at TST Products in Indiana. He worked as a Cummins engineer for 33 years and makes power/mileage products for those engines. 812-342-6741.
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My truck has an F in front of the 550 with a 7.3 liter. I made a typo