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.

From there, we’ve included every supporting piece you’ll need. That means the MPVi3 tuning interface, HP Tuners credits, The Dieselr 3.5" L5P Aftermarket Performance Downpipe and a set of Dieselr-sourced exhaust components: race pipes, downpipe-back systems, and a clean-fit EGR kit for full support.

The 2024–2025 Duramax L5P Dieselr collection is built for drivers who want control, power, and a clean install. Every product in this lineup has been fitted and tested in-house on our own L5P trucks — not just listed in theory. If it’s here, it works.

Whether you’re prepping for tuning or already tuned and need the right parts to back it up, this is your complete L5P support hub. ECM unlocks, cables, exhaust kits, and every detail you need — all in one place.

Order once. Get it done right. Dieselr has your 2024–2025 L5P 6.6L GM Duramax covered.