GMC Sierra 2017 -> 6.6 V8 445hp
Real standard and upgraded performance figures for the 6.6 V8 445hp engine in the GMC Sierra 2017 ->.
Below: measured output for the 6.6 V8 445hp in the GMC Sierra 2017 ->, standard vs. remapped, in both horsepower and torque.
| Horsepower (HP) | Torque (Nm) | |
|---|---|---|
| Standard | 445 | 1234 |
| Stage 1 | 500 | 1350 |
| Stage 2 | 527 | 1408 |
- Make
- GMC
- Model
- Sierra
- Generation
- 2017 ->
- Engine
- 6.6 V8 445hp
- Fuel type
- diesel
Frequently asked questions
Is Stage 1 tuning safe for the GMC Sierra 2017 -> 6.6 V8 445hp?
Yes — Stage 1 for this engine is a software-only remap calibrated to stay within its stock mechanical limits (turbo, clutch, fueling), so no hardware changes are required.
How much more power does the 6.6 V8 445hp make after tuning?
Standard output is 445 HP / 1234 Nm; Stage 1 on this engine typically reaches 500 HP / 1350 Nm. Exact results can vary slightly with fuel quality and vehicle condition.
How long does a GMC Sierra 2017 -> 6.6 V8 445hp remap take?
Once your original file is uploaded through the member panel, most requests for this engine are completed within a few hours.
Can the 6.6 V8 445hp be reverted to its original file?
Yes — we keep the original file on record for the request, so the ECU can be put back to stock at any time.