Mercenary autocal tuner for your 2004-2005 LLY equipped vehicle. This tuner comes with 5 power levels that are switch on the fly using either a dsp5 switch or the tuner itself. You can also use the Edge Insight CTS or CTSII. **The flashing procedure on LLY Trucks will most likely fail due to the age of the ECM. We recommend sending us the LLY ECM, we will bench flash your ECM, and send the Autocal back with the ECM.