13 reactions | Why go with Custom Tuning over a Box Tuner for your L5P? 1. More potential for power 2. Less soot production 3. Lower EGTs 4. Extracts more power out of bolt-on modifications 5. Lifetime Updates, Adjustments, and Support! Need another reason to make the switch? How about a $350 rebate when you trade in an applicable L5P box tuner? To learn more visit our website at: https://hubs.la/Q02M5-yl0 | Duramaxtuner.com | Facebook