Bully Dog’s ECM Tuner for Cummins®, is a response to fleet owners looking to tune and go. This heavy-duty tuner is streamlined to include 3 power levels, a speed limiter calibration feature and DTC Trouble Code Reader. The beauty of the ECM Tuner is in its simplicity; customers simply select the desired power level for the drive ahead, complete the install and store the tuner in their vehicle to enjoy the perks of Bully Dog tuning.