I don't really know either but I do know that the Erion's are pretty damn good. Honda is what they cater to. Yosh is just a good all around can. I think you'll be fine with the Erion's. Like sub said the Sato's are the best as far as slipons go.
Got to throw in my two cents. Like Sub, I'm running a full two into two Ti Akrapovic on my '03 with great results. While my comments are biased, I will say the previous owner ran a two into one Akrapovic system after scrapping the OE unit. He ended up buying the 2X2 which it now sports. His claim was that the 2X1 produced a slight gain in the mids, but those gains came with a significant loss of power in the higher RPM's. Just food for thought...
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