2004.5-2007 LLY/LBZ Duramax Engine Tuning

Custom engine calibration for the 2004.5–2007 LLY/LBZ 6.6L Duramax — engine-only tuning for the driver who wants aggressive power without a TCM calibration.

What's included

• Custom VIN-matched LLY or LBZ ECM calibration with switchable power levels
• Fueling, timing, boost, and exhaust gas temperature calibration
• Datalogging support for ongoing refinement

How it works

Files are delivered via EFI Live FlashScan V2. Your calibration is built from your stock ECM file and VIN-locked. A FlashScan V2 device is required to flash the ECM.

Support tiers

• Limited (4 Weeks): Four weeks of revision rounds; tune stays on your tool after the window closes.
• Full (Lifetime): Unlimited revisions and lifetime access.

Requires an EFI Live FlashScan V2 device. Specify LLY or LBZ at time of order. Engine tune only — does not include Allison TCM calibration.

Calibrations are developed for motorsport and off-road use. Verify local regulations before use on public roads.