I can't hear much sound difference. Can I return it?

It is best that you drive the car more to evaluate the sound difference 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 it should be an improvement as now the valves will be always open.

If you ever do further exhaust modifications, 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.

Unfortunately returns are not accepted due to:

• Sound change
• Personal sound preference
• Comparison to online videos
• Louder or quieter than expected results

As sound perception is subjective and varies between vehicles.