Dave
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The DYNA has a 1-1/4 metal pipe down the center, with an outer chrome shell. The metal pipe has a metal plug in the middle of the pipe, and a series of holes on the front and back of that plug. The exhaust travels down the pipe until it gets to the plug, then flows out the holes to the space between the pipe and the outer chrome shell, and then it flows back through the holes behind the plug into the center tube.....and then out the back.
If you want more noise....then drill a hole in that plug. You need a long drill sometimes called an "aircraft drill". You can also use a standard drill bit held into an extension. Start with a small hole about 1/4", and you can make it larger if you want more sound.
Some folks will insert a metal rod and use a hammer and drive the plug out....which pretty much just makes it a very loud straight through pipe that looks like a muffler. There actually won't be an "muffle" going on once you drive the plug out.
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