Ohhhhhhh, the MF2. Most people who get the FMAX kits just ditch that, since it's not that great for fuel management. Most of the time you end up with fuel pooling in your charge piping. It's not really an FMU in the sense that a Vortech or other rising rate regulator is. It's an additional injector controller that controls the extra 2 injectors somewhat independently of the rest of the fuel system. Since it's kind of hard to get tuned right, most people either go with simpler forms of fuel management, or go standalone.