Remote ECU tune · 6.6L Duramax LMM V8 turbo-diesel
A custom Stage 1, 2 or 3 calibration for your Chevrolet Silverado / Sierra 2500HD/3500HD 6.6 Duramax LMM, built by hand by a real tuner from your own stock file and datalog, and back with you within three hours of the file arriving. We tune these cars remotely, worldwide: you read and flash with your own HP Tuners interface, and you pay only once the tune is delivered.
Stock vs tuned
From the factory the Chevrolet Silverado / Sierra 2500HD/3500HD 6.6 Duramax LMM makes 365 hp and 660 lb-ft (895 Nm). A Stage 1 tune typically adds 45–120 hp and 148–240 lb-ft, for around 410–485 hp in total. With bolt-ons and a Stage 2 calibration that grows to +70–140 hp, and a Stage 3 build — drop-in upgraded turbo and fuelling — typically lands at 515–605 hp.
| Stage | Added power | Added torque | Total power | Total torque |
|---|---|---|---|---|
| Stock | — | — | 365 hp | 660 lb-ft (895 Nm) |
| Stage 1 | +45–120 hp | +148–240 lb-ft (+200–325 Nm) | 410–485 hp | 808–900 lb-ft (1,095–1,220 Nm) |
| Stage 2 | +70–140 hp | +177–273 lb-ft (+240–370 Nm) | 435–505 hp | 837–933 lb-ft (1,135–1,265 Nm) |
| Stage 3 | +150–240 hp | +251–384 lb-ft (+340–520 Nm) | 515–605 hp | 911–1,044 lb-ft (1,235–1,415 Nm) |
Typical gains from published dyno results; your car will vary with fuel, mods and conditions.
Supported versions
HP Tuners lists 2 Chevrolet Silverado / Sierra 2500HD/3500HD 6.6 Duramax LMM entries covering 2007–2010, with 6.6-litre engines, diesel versions included. Interface: MPVI2 or newer.
| Years | Make | Model / engine as HP Tuners lists it | Controller | Credits | Unlimited licence | Interface |
|---|---|---|---|---|---|---|
| 2007.5–2010 | Chevrolet | Silverado 6.6 Duramax (Diesel) (LMM) | Engine | 2 | 6 | MPVI2/2+/3/4 |
| 2007.5–2010 | GMC | Sierra 6.6 Duramax (Diesel) (LMM) | Engine | 2 | 6 | MPVI2/2+/3/4 |
Support data per HP Tuners' supported-vehicle list (June 2026). Check your exact car on HP Tuners' vehicle list before you buy credits.
Stages & prices
One flat price per stage, the same for every car: $250 for Stage 1, $450 for Stage 2 and $650 for Stage 3. Ordering is free and you pay only once the finished tune is delivered. 2 free revisions are included with every order. Gearbox (TCM) shift tuning is included wherever your car's transmission controller can be accessed.
Software only. Every map in the engine ECM is recalibrated for the Chevrolet Silverado / Sierra 2500HD/3500HD 6.6 Duramax LMM as it sits today — spark, fuelling, throttle response and limiters — against the datalog you send.
For a Chevrolet Silverado / Sierra 2500HD/3500HD 6.6 Duramax LMM with bolt-ons fitted — intake, exhaust, headers or downpipe, and an intercooler where the car has one. The airflow and fuelling are rebuilt around the hardware you actually have.
Stage 3 on the Chevrolet Silverado / Sierra 2500HD/3500HD 6.6 Duramax LMM means drop-in upgraded turbo and fuelling. The fuel, spark and boost maps are written from scratch for your exact combination.
Typical gains from published dyno results; your car will vary with fuel, mods and conditions.
Before you order
How it works
FAQ
Typically 45–120 hp and 148–240 lb-ft (200–325 Nm) over the stock 365 hp, for around 410–485 hp in total. Typical gains from published dyno results; your car will vary with fuel, mods and conditions.
An HP Tuners interface (we recommend the MPVI4), the HP Tuners credits needed to license the engine ECM for writing, and your stock file plus a datalog of a drive. You read and flash the car yourself; we build the calibration.
Your custom tune is delivered within three hours of your stock file arriving. Six tuners work three shifts, so a file that lands in the middle of the night is picked up just as fast.
Stage 1 is $250, Stage 2 is $450 and Stage 3 is $650, flat. Ordering is free and you pay only once the finished tune is delivered. 2 free revisions are included with every order.
Stage 3 on the Chevrolet Silverado / Sierra 2500HD/3500HD 6.6 Duramax LMM means drop-in upgraded turbo and fuelling. The maps are written from scratch for your build, and typical results are 150–240 hp over stock. Typical gains from published dyno results; your car will vary with fuel, mods and conditions.
