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2017-2022 GMC/Chevy L5P Duramax 6.6L Tuning | HP Tuners

(1 customer review)

From: $843.71

Gain 165+ HP and increase torque. Maximize efficiency and drastically enhance your truck’s throttle response. We strongly recommend that you add TCM tuning to your package for maximum performance.

  • Level 1: Valet (Limited Power)
  • Level 2: +60 HP
  • Level 3: +100 HP
  • Level 4: +130 HP
  • Level 5: +165 HP

HPTuners Modified ECMs & TCMs are currently on backorder. We expect to receive them in small quantities and will ship out accordingly.

This tuning package can only be installed using the HP Tuners RTD or MPVI2.

PPEI is making great strides in expanding the performance of on-highway vehicles and only offers emissions compliant tuning.

Modified L5P ECM

A modified HP Tuners L5P E41 ECM is required to flash your vehicle. Select this option if you do not have a modified ECM.

HP Tuners RTD

An RTD (or MPVI2) is required to tune your vehicle. Please select this option if you do not have one available.

Switch on the Fly Tuning (SOTF)

Enable the ability to change tunes through your steering wheel with the OEM Cruise Control buttons.

Flashing Credits

8 Credits are required to flash your ECM with the RTD (or MPVI2). Please select this option if you do not have credits.

SKU: T-1721D-HPT Categories: , Tag: Compatible Years: 2017, 2018, 2019, 2020, 2021, 2022 Compatible Model/Engine: GMC/Chevy L5P Duramax
Horsepower 445 RWHP

Why choose PPEI for your tuning needs?

We’ve built our team through passion. We are all activists for vehicle improvements and have built our reputation by Redefining the Limits. Each member of our team is expertly trained to perform all tasks based on your needs and our tuning is created by the brightest minds in the industry. Collectively we’ve amassed over 10,000 hours of testing on over 200,000 vehicle in over 30 different countries. We work harder.

What makes PPEI better?

  • Our dedication to the industry.
  • World class engineering team.
  • State of the art dyno facility and testing software.
  • 12 years as industry leaders.
  • Commitment to progress.

How is your tuning processed/delivered?

When you place an order for tuning all of your vehicle data, modifications, and inputs are immediately delivered to one of our elite calibration specialists. Our specialist then manually writes and creates a tune file specifically for your vehicle details. After your tune has passed all of our quality checks, it is delivered via email and stored using our order processing system. This system allows us to keep a detailed record of your vehicle details, tuning adjustments, and provide you with fast and accurate support.

What this means for you:

  • Tuning built to fit your unique vehicle.
  • Quality checked and dyno tested.
  • Fast delivery through our processing system.
  • Smarter support and tuning adjustments.

Is it safe and will it void my warranty?

Our tuning is safer for your vehicle than taking it in for an oil change and you’re always able to return your vehicle to its factory settings to take advantage of warranty services.

Hundreds of thousands of drivers trust PPEI for all of their tuning needs.

Still have questions?

We’re always looking to provide you with all of the information you need to make an educated decision.

Call Us



Modified L5P ECM

Weight 6 lbs

HP Tuners RTD

Weight 2 lbs

Switch on the Fly Tuning (SOTF)



Flashing Credits


  1. Elmer Braum

    Has really woke up my l5p.

Only logged in customers who have purchased this product may leave a review.

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Redefining The Limits


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Vehicles Tuned

2 Million+

HP Gained


Dyno Tests