Collection: 2024-2025 GM Duramax L5P 6.6L - Tune Files

Real files. Real tuning for the new generation of Duramax.

This is the 2024–2025 L5P Tune Files Dieselr collection — your one-stop source for the first and only +125HP custom tuning file available for the new GM E42 ECM, plus the required Global B ECM Unlock Service powered by HP Tuners.

We’re not just first to market — we’re tuning the trucks ourselves.

Dieselr’s +125HP single tune file was developed, dyno-tested in house on real 2024+ L5Ps, and built for drivability, towing, and safe power delivery. No inflated claims. No fake files. Just verified results: 575HP and 1,230 lb-ft of torque on our own test fleet.

Whether you're running a 2024–2025 Silverado or Sierra HD with the 6.6L L5P, this is your first and only step toward proven, tested tuning.

Order your file. Send your ECM. We’ll take care of the rest — the Dieselr way.