Originally Posted by
Jim.Thompson
I have decided to make another one. I will use two concentric tubes, the inner one perforated with many holes and the gap in between packed with stainless scubbing pads. There is a name for this type of muffler, but I can't think of it.
Hi Jim i have made a few and i get a good simple muffling effect by running the stinger tubes all the way through to the base of the exhaust box and the tubes inside the box i drill large holes that breaks up the sound wave as it finds its way out.
Personally i would not use scrubbing pads as all exhausts suck and blow and any loose scrubbing metal may get sucked into the engine.
As stated get the main box as big as possible as hot exhaust gasses need somewhere to expand.
Dave.