Why does it not make a difference in sport / race / dynamic?

The controllers do make a difference in sport / race / dynamic modes!

Even in these modes the valves are not not always open. The valves close in certain RPMs, throttle positions, speeds, gears etc.

The valves can be open while the car is stationary in the "loud" modes, however as you drive they close.

With the Exhaust Controller, the valves will remain open all the time!