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In order to keep the light off, you will need to use a programmer such as a bully dog or edge tuner to turn off the light. Most people see a large increase in fuel economy after doing this and it wont take long to cover the cost of the delete kit and the programmer in the fuel you will save. Interested in a new exhaust system for your 6.4L Power Stroke? With all of the sensors connected and the exhaust system connected, the final eye was given to make sure everything fit perfectly before we tightened