The Marauder ECU has a voltage table with the voltages required by the fuel pump(s) to maintain a desired fuel flow rate. Stock tunes carry values that are built to work across a large number of vehicles but you can greatly improve driveability by focusing table ranges on only what your car will actually encounter (a very basic example is if a tune contains data for running at 7000 RPM but you've set your rev limiter to 6000 - you do not need the 7000K data). Here I will also discuss changing XNorm and YNorm (table axis) values in Advantage III, which is an important step for building a tune specific to one vehicle. I had discussed this a bit previously in my LiveLink thread here, but I need to start a dedicated thread to give this subject the detail it deserves.