Considering an ECU remap for your GMC Sierra 6.6 V8 445hp? A Stage 1 remap can take this 2017 -> diesel engine from 445 BHP to 500 BHP and from 1234 Nm to 1350 Nm of torque (turbocharged). This engine scores 6.5/10 for remap suitability. Get a free personalised quote from a trusted remap professional and find out exactly what your GMC Sierra can achieve.
Comparisons are calculated from our own recorded Stage 1 figures.
The GMC Sierra 6.6 V8 445hp is a 6.6L turbocharged diesel engine producing 445 BHP and 1234 Nm from the factory. With a typical Stage 1 remap, output increases to approximately 500 BHP and 1350 Nm — a gain of around 55 BHP (12%) and 116 Nm (9%).
This engine has moderate remap suitability, with gains weighted towards peak power — the improvement is most noticeable at higher RPM. The tuning headroom is classified as moderate, based on the percentage gain available from the factory output.
Considerations: High tuned torque: check transmission torque capacity and service history.
All figures shown are typical estimates based on aggregated Stage 1 data for this engine variant. Actual results depend on vehicle condition, mileage, and the chosen tuning method. We recommend discussing your specific vehicle with a qualified remap professional.
| Engine | BHP | Gain | Torque | Gain | Score |
|---|
| 4.3 V6 285hp | 285 → 305 | +20 | 413 → 440 | +27 | Limited (3.5/10) |
| 5.3 V8 355hp | 355 → 375 | +20 | 519 → 540 | +21 | Limited (3/10) |
| 6.0 V8 360hp | 360 → 383 | +23 | 515 → 539 | +24 | Limited (3.5/10) |
| 6.2 V8 420hp | 420 → 440 | +20 | 609 → 630 | +21 | Limited (3/10) |
Get a personalised remap quote for your GMC Sierra. We'll connect you with a trusted professional in your area.
All figures shown are typical estimates based on aggregated Stage 1 data for this engine variant. Actual results depend on vehicle condition, mileage, and the chosen tuning method.
We recommend discussing your specific vehicle with a qualified remap professional before proceeding.
