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In the X3M/X4M video, she revved it up to 5k rpm. The sound is overall a bit deeper than S55 ZCP, and more importantly is less raspy - though we're not sure about the last 2k rpm of S58.
Fitted with MPE, or even stock ZCP muffler, S55 sound is acceptable below 4k (and some of us even think it's good) but above that it's terribly raspy.
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Lemania 2320
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