03/09/2026
How much difference do exhaust valves actually make?
This BMW M5 G99 is fitted with an iPE cat-back system. Same car, same exhaust, the only difference is the valve position.
With the valves closed, the sound is more controlled and suitable for normal driving. Open them and the character of the car changes completely.
This is important to consider when choosing a performance exhaust. It is not only about how good the system sounds at full volume, but also how well you can control it.
Especially on a car like the M5, which can easily be used every day, that difference matters.
Would you still choose a performance exhaust without valves?