Question about Tenzo R mufflers

[KwikR6]

Originally posted by Trixta6

Anyone see that butterfly valve that goes between the 2 halves of a 2 piece 4-2-1 system? It's supposed to restrict flow so you can "Tune" your exhaust for sound & then open it up when you want full flow/sound. Is one of these worth getting?

There is also a "valve" on some exhaust (basically a silencer) that you can twist to tune the sound of your car. They come on a fireball style exhaust.