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Sorry to be a skeptic, but I don't see how the balance tube would eliminate the drone, especially with straight through mufflers. I had a GHL exhaust which also has a balance tube and it droned quite a bit. The drone is due to the short length of the exhaust path. The only way around it is to create a longer exhaust path, which is essentially what the stock exhaust does, or to incorporate a resonance camber, which would require a lot of R&D.
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