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If you guys have drone I reccomend a helmholtz resonator that any exhaust shop should have no trouble fabbing up, you will likely have drone at 100-120hz. They are like J pipes only much more forgiving on what size they have to be.
I had one done on mine for 1800-2500 rpm drone and worked like a charm. 12.5x4 inch chamber + 6-8 x 2 inch neck.
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