Does it exist??
I don't know or remember where I heard this, but.
Is there a type of muffer, that is hush hush quiet at idle speeds, etc, but when the throttle is wide open, (more vaccumn) the muffler opens up nicly to let a nice purr? I think that type of muffler would be vaccumn modulated, meaning when vaccumn pressure is high, the muffler opens up, to allow more airflow, and a nice deep sound. However, when the throttle or vaccumn demand is not there, (light accelleration and idle) the exhaust is hush hush quiet?
If so, is there such a setup avalible for our cars?
2009 Pontiac Vibe AWD 2.4
1993 Buick Park Avenue 3800
1984 Chevrolet Citation 2.5 liter four.