22 February 2026Published by vfidiesel.com on 22 February 2026Categories Diesel Fuel InjectionDuramax CP4 to CP3 Conversion: Is It Worth It?Why Duramax Owners Are Ditching the CP4 If you own a 2011+ Duramax — LML, L5P, or any variant running the Bosch CP4.2 injection pump — […]