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I know there's a couple of moderators from there that frequent this place, hoping to catch their attention.... -
Heh. Just rev it to 7800 and look for signs of valve float in the dyno plot. -
More likely ceramic, but yes, possibly metal. Another factor is that street legal (in Japan) aftermarket exhausts have to meet some noise rules that generally means that a 3" exhaust will likely have a 2 or 2.5" restriction somewhere inside it. If the exhaust has a JASMA tag on it, and hasn't had that restriction found and removed, then, the course of action is obvious.
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