2024-2026 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.

Once you’ve shared your stock read with your tuner in the TDN app, please email us. We’ll notify the tuning company and keep things moving.

These are tune files only. You need an RTD4 Device and credits to flash these tunes. Click here for the device.

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. 
• Requires HP Tuners MPVI device and credits
  • Compatible with RTD4 Devices
• Stock reads and INFO logs required before files are built

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.