2024-2026 L5P Duramax Peakside HP Tuners RTD4 Custom Tune Files (PSP-24-26-DMAX-HP)

Fits

Unleash the full potential of your 2024–2026 L5P Duramax with Peakside Performance Custom Tuning using the HP Tuners RTD4 (Remote Tuning Device). Designed for seamless remote calibration, this setup gives you the same power, drivability, and refinement as an in-shop tune, without ever leaving your driveway. Our custom calibrations are built to enhance throttle response, torque delivery, towing performance, and fuel efficiency, all while maintaining factory safety protocols. 

You must have an unlocked E42 ECM from HP Tuners. Unlock my ECM. This tuning requires 8 Universal HP Tuner Credits.

These are tune files only. You need an HP Tuners MPVI device and credits to flash these tunes. Click here for the device, and here for the credits. 

Part Number: PSP-24-26-DMAX-HP

• Custom tuning for the latest 2024–2026 GM L5P Duramax operating systems.
• Seamless remote tuning through HP Tuners TDN (Tune Delivery Network).
• Custom torque management and shift refinement for improved drivability.
• Optimized towing, economy, and performance tune options.
• Improved throttle mapping and reduced turbo lag.

1. Plug your RTD4 into the OBDII port and connect via Bluetooth or USB.
2. Use the HP Tuners TDN app to send your stock file to Peakside Performance. Once you order, we will email you an invite link to accept us to be your tuner.
3. Receive your custom tune directly through the app — no shipping required.
4. Flash your new tune, drive, and feel the difference.