![Image](http://www.s-10crewcab.com/coppermine/albums/userpics/10006/muf2.jpg)
![Image](http://www.s-10crewcab.com/coppermine/albums/userpics/10006/muf.jpg)
It is difficult to get a focused photo of the little pipe that is in the center baffle, but it is , maybe 1" diameter. Granted there are probably two or three, but not only is the size very small the design just does not promote good flow characteristics.
It is no wonder that the truck is so quiet.
For those who may say the backpressure is needed for bottom end torque....
![Exclamation :!:](./images/smilies/icon_exclaim.gif)