The only person I know personally who has made the switch from dual to single is Matt (mattlorentzoe) on his G37x. He had a FI exhaust and switched to a SOHO single and picked up 5whp/7wtq. It isn't much, and could be dyno variances, but before and after we done same day I believe.
Moncel and Jon have mentioned in various FB posts that they have seen singles make slightly more power also.
In the end, it is overall a style and sound preference.
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