Tech guides
Diesel tech guides
What fails on Cummins, Power Stroke and Duramax trucks, why it happens, and the part that fixes it. Written by the people who do the work.
26 guides
2003–2004.5 5.9L Cummins Injector & CP3 Sizing Guide: How to Choose the Right Fuel Setup (Common Rail)
Looking to take your 2003–2004.5 5.9L Cummins to the next level? Whether you're chasing 600 horsepower or going all-in for 1200, this guide breaks down proven fuel...
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