It doesn't work, what can I do?


We recommend reviewing the How It Works page as well as the Testing Guide for more info with video examples.


The controller has two modes:

  1. ON - valves stay fully open all the time in all modes
  2. OFF - valves return to normal and open and close as they normally would

The controller does not force the valves closed, only open. 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. This is for safety as forcing the valves closed when the car requires them to be open can potentially cause damage.


Valves open already

If the valves are already open, then the controller will switch between:

  1. ON - valves stay open - controller will prevent valves from closing while driving
  2. OFF - valves still open - since the car already has them open.

Loud mode

In the car's loudest mode the exhaust valves are open only some of the time. Even in loud / sport / race modes they close in certain RPMs, throttle positions, speeds and gears. The role of the exhaust controller is to keep the valves fully open all the time (no matter what drive mode) and throughout the whole RPM range.


Stationary / idling

While stationary / idling the valves can already be open, especially when the car is warming up, so pressing the ON button will simply keep them open, so the difference will be while driving.


Driving

It is best that you drive the car a bit more to evaluate 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, but there will be an improvement as now the valves will be always open.


Sound Difference

It will make the exhaust louder in the times the valves were normally closed. The sound difference will all depend on the actual car and exhaust design as all different makes & models have different exhaust designs and how the car controls the valves.


The controller will make the exhaust sound louder when in certain RPM ranges when the valves are normally closed. It won't be a higher volume than the loudest the exhaust can go (full throttle / high RPM when the car already has the valves open) as that'll require physical exhaust mods such as muffler / resonator delete / modification or full exhaust swap. If you ever do further exhaust modifications, the difference will be even more noticeable as the controller will get the most out of the upgrade.


The controller will bring out the maximum potential of whichever exhaust setup you have as the valves will now remain filly open.



Note for particular Mercedes-Benz models

As mentioned on the product page for this model,:

  • The controller takes 5 seconds for the valves to open after pressing the on button.
  • The valves require a new signal from the car to close after turning the controller off (either from changing the drive modes or throttle input). If you blip the accelerator, the car will send a new signal to the actuators and the valves will close and return back to normal. But while driving the signals are sent so frequently that as soon as you press the off button, the car will regain control of the valves right away.

Here is a video showing how it works. Note the 5 second delay and the throttle input to close the valve.