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No, the ES Oval is not chambered from what I hear. But it's suppose to be one of the quietest if not the quietest straight through muffler on the market. Then again, I suppose that also has to do with what resonator you use. Good luck in whatever choice you make. Some ppl just prefer the ES cuz it looks stock.
I really like my supertrapp, you really don't see a lot of them (never on a honda anyway) you can runn it wide open,or adjust the pitch by adding or removing the diffusor spacers.