2024/2026 l5p Duramax hp tuners

The 2024–2026 L5P  Tune File that customers have been waiting for is now available. This is are single-level, Upto +180HP custom tuning files created for the 2024-2026 6.6L Duramax L5P equipped with the latest E42 (Global B) ECM. It’s written for the HP Tuners RTD4 platform and designed to deliver clean power with no guesswork.

This  custom file is dyno-tested on real 2024–2026 L5P trucks. The stock output baseline was 433HP. With this file, our dyno pulled 613HP and 1,230 lb-ft of torque.  Speed limiter has been removed.. It’s calibrated for drivability, towing, and power under load — not just theoretical numbers. It’s a safe, no-nonsense first step into real E42 tuning.

To run this file, your ECM must be unlocked using the E42 Upgrade Service. We require your VIN before purchase, and you’ll complete a tuning form after unlock.

Quick Overview:

• Upto +180HP single-level L5P tunes
• Built for HP Tuners RTD4 (Sold Separately)
• Requires 8 credits to flash
• ECM unlock required (E42 Global B platform)
• No SOTF support or alternate power levels
• Speed limiter removed
• CAN bus plugs not yet available — Can Bus Systems - NOx & DEF must remain plugged or tied in place. Functionality is unaffected