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    CP4 to CP-ISB21S3 (revised CP3) change for 2021 6.7L Diesel Trucks -- Merged Threads

    Anyone have any idea how the newer “symmetrical” cp.4 pumps are holding up? Just wondering if they are fairing any better than the early models. I have a 2020 2500 built in November. About 7,000 miles on it at this point.
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