This mod will modify your stock ECU with a Timing Advance resistor. This resistor connects to the car's ECU by replacing the Intake Airflow Temperature (IAT) Sensor. Once the resistor is installed, the ECU will read that the air coming in through the intake is cold air; think of it as a "default" setting on the ECU. When the ECU reads this, it lean out the air/fuel mixture-in other words, it will take in more air, and then add more fuel to compensate for the extra air coming in, thus, producing more power and advancing timing 1 to 2 degrees. Because the engine is creating more power, it will need more fuel; so the fuel economy on the car will increase 1 to 2 miles per gallon (MPG), but definitely not more than 2 MPG. Get rid of that government regulation chip and release the potential of your engine!