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

First, check out the How It Works page that explains how the Exhaust Controllers work in detail.

The sound difference

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.

It does not increase the maximum volume achievable by the exhaust system (e.g., at full throttle or high RPM when the car's valves are already open), as this would require physical modifications to the exhaust system, such as muffler or resonator delete or modification, or a complete exhaust system upgrade. An exhaust controller can only control the factory exhaust valves. It does not modify or replace the exhaust system.

Testing

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.

Also see the Testing Guide here.

Driving

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.

Want more sound?

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.

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.

Please note returns are not available based on sound perception, as results vary depending on exhaust design, valve programming, and driving conditions (Section 4 Refund Policy).