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Keith,
I've got a set of sidepipes that have a 24" spiral baffle in a 4" pipe. I also have a set of pipes with 3-1/2" x 12" perforated core mufflers and another set with 3" x 18" perforated core mufflers.
The spirals are much quieter than the straight thrus. They also make a lot less power.
Scott
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