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The N1 single I think was dynoed in SCC a while back. I don't have it though, but I think they got a good gain.
The Dual is supposed to have more backpressure at low RPMs but still have plenty of flow (even more than the single) at high rpms. At least thats what Apexi says, but they could be just BSing.
To me it's worth it to get dual, just to not look like all the Honda guys with their $75 "Performance Muffler" on their stock piping.
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