E46 M3 WMI Design

[rotrex]

IMHO there is litte to be gained. You willl have a hard time getting a good distribution across the 6 cylinders. Any droplets hitting the wall of the chamber will be cooling the metal, not the gas. As this vapor needs space, the oxygen concentration drops.
Only droplets evaporating in gas lead to a significant density increase as they cool the gas. Cooling the walls get you the vapour volume, but not the cooler gas with its higher density.
I posted a scientific publication in the publication section of this forum on this effect.

Unless you have intake air temperatures exceeding some 60C under sustained WOT, I would not bother. Compared to the direct port jets, there is litte extra effect.