Q: The BD ficm -does it matter if I have a 4pin/7pin deal? I honestly don’t know what I have either. It’s an 05. I’m just hoping this increases mpg on my dually with 410 gears. I don’t need php ficm tuning with this do I? Or is ficm tuning only for stock ficm? Thanks
A: This FICM fits all years. You might pick up a little fuel economy but it's not going to be substantial. You can do the 58V and the tune if you wanted.