High flow muffler options?

BS??

I have straight through Donaldson's on mine. With bullhauler stacks, the sound is much louder at ground level. You could hear the jakes reverberating off the buildings.

With straight stacks back on it, most of the sound is directed upward. No echo off the buildings.

 

Rpm.

 

I remember looking inside because i never purchased them before and was curious, they had no restrictions through the center.
The boxes were sealed as were the ones i just purchased with no markings on the outside of the box.

 

The sounds is always there. A truck with straight pipes pointed to the sky makes every bit as much racket as donkey ears.