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ok i see every one talking about them but i cant find a good definition about them. i under stand that it is used to differentiate between different versions of the same engine. so is there a list that i missed some were that has more explicit details about each cpl number? which one is the best, which the worst?
 

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You should find a listing of the most common CPL's in your Cummins service manual located in the Turbo section.
 
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