All-In-One 2017–2023 L5P Duramax Off-Road Performance Kit
Bored of your stock L5P? This all-in-one performance package is designed to unleash the full potential of your 2017–2023 Duramax combining everything you need for serious power, smoother shifts, and improved reliability.
This isn’t a cookie-cutter tune kit it’s a complete, professionally built off-road performance system with custom tuning, hardware, and software included. Whether you’re towing, racing, or daily driving, this kit transforms your truck from mild to monster.
⚙️ What’s Included:
1️⃣ Five Switch-On-The-Fly (SOTF) Engine Tunes
Custom-built in-house with balanced fueling and torque management for every driving style:
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Position 0: Stock power (OEM performance)
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Position 1: +30 HP — perfect for heavy towing
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Position 2: +80 HP — great for light towing or daily efficiency
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Position 3: +135 HP — ideal for everyday driving and spirited use
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Position 4: +160 HP — strong street tune with crisp throttle response
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Position 5: +200 HP — maximum effort, full-performance file
All tunes are written to your VIN and modifications, ensuring smooth transitions, safe EGTs, and zero lag between modes.
2️⃣ Transmission Tuning for 6-Speed (T87A) & 10-Speed (T93)
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Optimizes shift points, torque limits, and line pressure.
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Reduces premature upshifts and hesitation under load.
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Increases clutch holding capacity and overall drivetrain strength.
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Custom torque converter lock-up logic for towing and high-load performance.
You’ll feel tighter, faster shifts with smoother power delivery perfectly matched to your ECM tuning.
3️⃣ E41 Unlock Cable
Required to unlock your L5P’s ECM for tuning access. This cable makes it possible to read and flash custom calibrations safely and effectively.
4️⃣ Unlocked TCM (Transmission Control Module)
Fully unlocked and ready for tuning essential for enabling transmission calibration on newer models (T87A / T93).
5️⃣ HP Tuners MPVI3 with 12 Universal Credits
The latest generation of HP Tuners hardware, including 12 credits, allowing you to flash your ECM and TCM directly.
6️⃣ CAN Bus Plugs
OEM-grade CAN connectors required for communication between modules during tuning and flashing.
7️⃣ Performance EGR Solution
Designed for off-road use only, this component improves exhaust flow and reliability by reducing carbon buildup and heat soak.
8️⃣ High-Flow Downpipe
Upgraded stainless steel downpipe improves exhaust velocity, reduces drive pressure, and enhances turbo sound.
9️⃣ Full 5” Stainless Downpipe-Back Exhaust
A straight-pipe stainless steel system delivering maximum flow, lower EGTs, and a deep, aggressive exhaust tone.
🧠 Transmission Tuning Benefits:
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Increased line pressure to hold more torque
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Revised shift scheduling for improved towing and daily driving
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Optimized torque converter lock-up strategy
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Faster, cleaner shifts with no harshness
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Better power transfer and cooler operating temps
All calibrations are balanced for power, reliability, and longevity — tuned by professionals who understand the Duramax platform inside and out.
⚙️ Requirements:
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Unlocked or modified T87A / T93 TCM
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HP Tuners MPVI3 / RTD device
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Applicable HP Tuners credits
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Unlocked ECM (via HP Tuners or included unlock cable)
⚠️ Important Notice:
This product is designed for off-road and motorsports use only.
Not legal for use on pollution-controlled vehicles operated on public roads.
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