Best Tuner For 2025 Duramax. Offers multiple power levels, suitable for different driving needs, and significantly boosts truck capabilities. The 2020 duramax l5p is rated at 445 horsepower and 910 foot pounds of torque.
In the world of diesel performance, the synergy between cutting. The custom tunes from gdp are excellent, many duramax owners on the forums claim they’re one of the best diesel tuners out there.
