I figured I'd share this with you guys for others benefit: I emailed Flowmaster and they sent me this:
Quote:
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Unfortunately we do not make any mufflers for Rotary motors because of the tremendous heat they produce. I honestly do not know if our products will live behind your motor very long and may be a waste of money
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I appreciate their honesty about it. So I suppose this leaves just rotary specific mufflers to consider....