I can't hear much difference. What Should I Do?

The role of the exhaust controller is to keep the valves open all the time in all modes and prevent them from closing again. It does not modify the exhaust hardware itself.

In the car's loudest mode the car opens the valves for only some of the time. Even in sport / race modes they close in certain RPMs, throttle positions, speeds, gears etc.

While stationary the valves are often open in the car's loud modes already, especially when the car is warming up, so the difference will be while driving. If you are testing by revving in park, the change may be minimal because the valves can often already open in this situation.

We recommend driving the car more to evaluate the sound as this is when you'll hear the difference the most. It depends on which drive mode you're in, the gear, car speed, throttle position and RPMs, as now the valves will be always open.

If you ever do further exhaust modifications, such as resonator or muffler modifications or aftermarket exhaust system upgrades, the difference will be even more noticeable.

Also these controllers do not force the valves closed, they only open them. So if the car already has the valves open, pressing the close button will not force them closed. That is why you wouldn't be able to hear the valves closing or make the car quieter. This is for safety as forcing the valves closed when the car requires them to be open can potentially cause damage.

The controller will get the most out of whichever exhaust system setup you have as the valves will now be fully open all the time instead of some of the time.

Returns are not available based on sound perception, as results vary depending on exhaust design, valve programming, and driving conditions.