Flow 3 improves the wave and the cleanliness of what it looks like. It creates more of a "yaw effect" of the hull. Helps the boat ride more level - less roll, but would not change the size of the wave b/c that has to do with weight/ballast in the boat.

The Flow 3 has a second actuator that is automated with the surf system - Moomba magic. It directs water flow from the hull (rooster tail) to how the wave behaves behind the boat - delayed convergence effect.

To explain it a little more, take a look at this: