GMC SIERRA HD 2500/3500 6.6L DURAMAX DIESEL – STAGE 1 PERFORMANCE SOFTWARE
$1,299.00
Stage 1: 445HP → 500HP (+55HP) | 910 → 1070 lb-ft (+159 lb-ft). Stage 2: 560HP / 1195 lb-ft. Bosch E41 / E42. OBD flash. 100% reversible.
GMC SIERRA HD 2500/3500 6.6L DURAMAX DIESEL (2017-2024) — STAGE 1 & STAGE 2 PERFORMANCE TUNE
6.6L L5P Duramax Turbo Diesel V8 — Bosch E41 / E42 — OBD Flash
SKU: AMT.GMC.SIR.HD.66DSL.STG1
Performance Gains
| Specification | Original | Stage 1 | Stage 2 |
|---|---|---|---|
| Power (HP) | 445 | 500 (+55 HP) | 560 (+115 HP) |
| Torque (lb-ft) | 910 | 1070 (+159 lb-ft) | 1195 (+285 lb-ft) |
Required & Recommended Parts
| Tune | Required Parts | Recommended Parts |
|---|---|---|
| Stage 1 | — | Performance air filter |
| Stage 2 | — | High-flow air filter, performance exhaust |
Overview
The L5P Sierra HD is one of the strongest diesel tuning opportunities in the GM market because buyers already expect to pay for towing, drivability, and high torque refinement. The platform has a very mature tuning ecosystem, and even conservative tow oriented calibrations show meaningful gains while improving power delivery and reducing the feeling of factory torque limitation. This is a flagship diesel truck product for Canada and should be treated as a core revenue line.
Key Features
- Heavy tow tune angle is highly marketable
- strong gains available even before aggressive performance files
- mature aftermarket and large dealer demand
- highway towing and EGT management are major selling points
- flagship diesel product for western and rural Canadian markets
Vehicle Specifications
| Parameter | Specification |
|---|---|
| Production Years | 2017-2024 |
| Engine | 6.6L L5P Duramax Turbo Diesel V8 |
| ECU Type | Bosch E41 / E42 |
| Flash Method | OBD |
| Time Required | Same day (OBD flash) |
Programming Instructions
This vehicle is tuned via OBD port flash — no ECU removal required.
- Locate the OBD-II port (under the dashboard, driver’s side)
- Connect the AMT Tuning flash tool to the OBD port
- Follow the prompts to read your stock file (approx. 15–30 minutes)
- Send the stock file to AMT Tuning — we will prepare your custom tune
- Flash the returned tune file — your vehicle is ready to drive
- To revert: your original stock file is saved and can be flashed back at any time
Shipping & Contact
AMT Tuning Ltd, 6-25 Edilcan Drive, Concord, Ontario L4K 3S4 Canada
Phone: +1 877 469 9440 | Email: sales@amttuning.com
| Make | GMC |
|---|---|
| Vehicle Make | GMC |
| Model | GMC Sierra HD 2500/3500 6.6L Duramax Diesel |
| Production Year | 2017-2024 |
MAECENAS IACULIS
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ADIPISCING CONVALLIS BULUM
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