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The Industrial Injection CP4-to-CP3 conversion kit for 2011–2015 GM Duramax 6.6L LML replaces the CP4 pump with a CP3-style pump and includes the conversion pump. This kit requires tuning after installation. It is intended for Duramax LML owners seeking a CP3 conversion; the listing specifies model years and notes that engine calibration changes are required.
Industrial Injection 11-15 GM Duramax 6.6L LML CP4 to CP3 Conversion Kit with Pump (Tuning Req.)
