I am pretty positive the same effects as the VFF can be had with the LPR (Low Pressure Regulator) mod. This is a regulator like the pnumatics regulator on the autocockers, only installed on the impulse to control the pressure of the air sent to the solonoid.
So the max-flo would control the pressure to the LPR and to the valve, but the LPR would control how much goes to the solonoid.
While the VFF just split the air coming into the gun, so air went to the solonoid and to the valve but at the same pressure.
This LPR way will add efficency to the gun and it also helps to illiminate bolt stick and other problems that the VFF helped stop if I am not mistaken. All the fittings and such neccessary for the LPR conversion (including the LPR's themselves) are available through www.e-paintballoutlet.com
check out this URL for a pic of a gun with the LPR conversion. http://www.e-paintballoutlet.com/IMPPUPCULPR.jpg