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Ok I've gone and done it. Since good Ol' @MoparMom passed away. I've now gone and pull my muffler back off the truck and went back to straight piped exhaust again. 4 inch diamond eye, without a muffler will talk to the neighborhood rather well if you deep in the throttle. Now once you reach cruise state its not bad at all. I was shocked at the amount of soot loaded up in the muffler it was like tipping the muffler and bang it once on the ground was like watching black powder fall out pretty good amount too for single tap. All the muffler can was loaded with carbon.

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I have stock exhaust on my '91 less the muffler, it sounds okay, kinda like a tractor. No muffler on the Cummins powered Ford with twin stacks, it sounds awesome. 

 

I tried no muffler on my '01 with my new 4" exhaust, it was unacceptable. I passed a motor home on a hill pulling hard....scared us both:( On the open highway it was fine but in town and around heavy traffic it was gross....it has a muffler now.

 

Here I am pulling hard, 26k GCW, uphill, crossing a bridge, with a muffler, still plenty loud.

 

https://www.youtube.com/watch?v=iHRZMA3Gsfk

 

My twin stacked Ford, first start of the day.

 

https://www.youtube.com/watch?v=hy8NaAjxP34  

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