2024–2025 L5P Custom Tune File – Now Available
*ECM UNLOCK AND HP TUNERS DEVICE NOT INCLUDED*
The wait is over — our first custom tuning file for the 2024–2025 6.6L Duramax L5P with the latest E42 (Global B) ECM is here. Designed for the HP Tuners RTD4 platform, this single-level tune delivers clean, dyno-proven power without the guesswork.
Tested on real 2024–2025 L5P trucks, not simulations:
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Stock output baseline dramatically improved
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Significant gains in horsepower and torque
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Speed limiter: Removed
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Focus: Smooth drivability, strong towing performance, and power under load.
Requirements:
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ECM unlock via E42 Upgrade Service
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VIN required before purchase
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Tuning form completion after unlock
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8 RTD4 credits needed to flash
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No SOTF or alternate power levels
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CAN bus plugs not yet available
If you’re ready to start tuning your E42-equipped L5P, this is your entry point. Get the real numbers, the right way.
Order your 2024–2025 L5P Custom Tune File today.