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Collection: 2024-2025 GM Duramax 6.6L L5P

Serious tuning starts here. Dieselr brings real solutions for the 2024–2025 GM Duramax L5P — no waiting, no fluff, just tested parts that get the job done.

This collection is built around the new E42 ECM found in the latest Duramax trucks. To tune it, you need an HP Tuners E42 ECM Upgrade Service — and Dieselr offers it as a fast, reliable mail-in option backed by real techs.

18 products