This is most often done by fooling the fuel temp sensor readings. The new dials are, more or less, glorified electronic throttle limiters. But those methods work in the opposite way than they used to: now, they limit fuel and power to the engine from the new high-level tuning, as opposed to increasing it from stock with different tune files.
You may see some people with post-2010 trucks and a DSP5 dial, who have installed workarounds that (they say) allow them to go from the max setting, all the way down to the lowest one, changing their horsepower in between. This brings us to the biggest myth of modern SOTF tuning. So while we can tune up the ECM to give more power, it’s no longer able to switch between different files “on the fly.” This means that multiple tuning files are unusable, and any modifications have to work within the stock GM software. However, in 2011, the stock ECM in the Duramax vehicles were changed, and are no longer able to be customized in the same way.
