GMC Sierra 1999 - 2007 8,1 V8 330hp
Real standard and upgraded performance figures for the 8,1 V8 330hp engine in the GMC Sierra 1999 - 2007.
Below: measured output for the 8,1 V8 330hp in the GMC Sierra 1999 - 2007, standard vs. remapped, in both horsepower and torque.
| Horsepower (HP) | Torque (Nm) | |
|---|---|---|
| Standard | 330 | 610 |
| Stage 1 | 350 | 630 |
| Stage 2 | 360 | 640 |
- Make
- GMC
- Model
- Sierra
- Generation
- 1999 - 2007
- Engine
- 8,1 V8 330hp
- Fuel type
- petrol
Frequently asked questions
Is Stage 1 tuning safe for the GMC Sierra 1999 - 2007 8,1 V8 330hp?
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 8,1 V8 330hp make after tuning?
Standard output is 330 HP / 610 Nm; Stage 1 on this engine typically reaches 350 HP / 630 Nm. Exact results can vary slightly with fuel quality and vehicle condition.
How long does a GMC Sierra 1999 - 2007 8,1 V8 330hp 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 8,1 V8 330hp 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.