2024 Duramax 6.6 Tuning. If you want true custom l5p duramax tuning, you’re going to have to purchase an ecm swap, hp tuning hardware, and custom tunes separately. Shop our patented cold air intakes, diesel tuners, exhaust systems, throttle controllers, boost tubes, and more.

Tuning switches, mounts and knobs are also available for your vehicle. Due in large part to the new 10 speed allison transmission, the maximum tow rating increased substantially.